Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China
Identifieur interne : 000E07 ( Pmc/Curation ); précédent : 000E06; suivant : 000E08Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China
Auteurs : Xiaoyong Yuan [République populaire de Chine] ; Hui Song [République populaire de Chine] ; Gang Peng [États-Unis] ; Xia Hua [République populaire de Chine] ; Xin Tang [République populaire de Chine]Source :
- Journal of Ophthalmology [ 2090-004X ] ; 2014.
Abstract
Url:
DOI: 10.1155/2014/536412
PubMed: 24991429
PubMed Central: 4060487
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China</title><author><name sortKey="Yuan, Xiaoyong" sort="Yuan, Xiaoyong" uniqKey="Yuan X" first="Xiaoyong" last="Yuan">Xiaoyong Yuan</name><affiliation wicri:level="1"><nlm:aff id="I1">Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020</wicri:regionArea></affiliation></author><author><name sortKey="Song, Hui" sort="Song, Hui" uniqKey="Song H" first="Hui" last="Song">Hui Song</name><affiliation wicri:level="1"><nlm:aff id="I1">Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020</wicri:regionArea></affiliation></author><author><name sortKey="Peng, Gang" sort="Peng, Gang" uniqKey="Peng G" first="Gang" last="Peng">Gang Peng</name><affiliation wicri:level="1"><nlm:aff id="I2">Department of Bioinformatics and Computational Biology, University of Texas, MD Anderson Cancer Center, Houston, TX 77030, USA</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Bioinformatics and Computational Biology, University of Texas, MD Anderson Cancer Center, Houston, TX 77030</wicri:regionArea></affiliation></author><author><name sortKey="Hua, Xia" sort="Hua, Xia" uniqKey="Hua X" first="Xia" last="Hua">Xia Hua</name><affiliation wicri:level="1"><nlm:aff id="I1">Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020</wicri:regionArea></affiliation></author><author><name sortKey="Tang, Xin" sort="Tang, Xin" uniqKey="Tang X" first="Xin" last="Tang">Xin Tang</name><affiliation wicri:level="1"><nlm:aff id="I1">Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">24991429</idno><idno type="pmc">4060487</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4060487</idno><idno type="RBID">PMC:4060487</idno><idno type="doi">10.1155/2014/536412</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">000E07</idno><idno type="wicri:Area/Pmc/Curation">000E07</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China</title><author><name sortKey="Yuan, Xiaoyong" sort="Yuan, Xiaoyong" uniqKey="Yuan X" first="Xiaoyong" last="Yuan">Xiaoyong Yuan</name><affiliation wicri:level="1"><nlm:aff id="I1">Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020</wicri:regionArea></affiliation></author><author><name sortKey="Song, Hui" sort="Song, Hui" uniqKey="Song H" first="Hui" last="Song">Hui Song</name><affiliation wicri:level="1"><nlm:aff id="I1">Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020</wicri:regionArea></affiliation></author><author><name sortKey="Peng, Gang" sort="Peng, Gang" uniqKey="Peng G" first="Gang" last="Peng">Gang Peng</name><affiliation wicri:level="1"><nlm:aff id="I2">Department of Bioinformatics and Computational Biology, University of Texas, MD Anderson Cancer Center, Houston, TX 77030, USA</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Bioinformatics and Computational Biology, University of Texas, MD Anderson Cancer Center, Houston, TX 77030</wicri:regionArea></affiliation></author><author><name sortKey="Hua, Xia" sort="Hua, Xia" uniqKey="Hua X" first="Xia" last="Hua">Xia Hua</name><affiliation wicri:level="1"><nlm:aff id="I1">Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020</wicri:regionArea></affiliation></author><author><name sortKey="Tang, Xin" sort="Tang, Xin" uniqKey="Tang X" first="Xin" last="Tang">Xin Tang</name><affiliation wicri:level="1"><nlm:aff id="I1">Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020</wicri:regionArea></affiliation></author></analytic><series><title level="j">Journal of Ophthalmology</title><idno type="ISSN">2090-004X</idno><idno type="eISSN">2090-0058</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p><italic>Purpose</italic>. To analyze the prevalence and presentation patterns of corneal astigmatism in cataract surgery candidates in a teaching hospital in northern China. <italic>Methods</italic>. From May 1, 2012, to April 30, 2013, partial coherence interferometry (IOLMaster) measurements of all qualified cataract surgery candidates were retrospectively collected and analyzed. <italic>Results</italic>. The study evaluated 12,449 eyes from 6,908 patients with a mean age of 69.80 ± 11.15 (SD) years. The corneal astigmatism was 0.5 diopters (D) or less in 20.76% of eyes, 1.0 D or more in 47.27% of eyes, 2.0 D or more in 13.16% of eyes, and 3.0 D or more in 3.75% of eyes. With-the-rule astigmatism was found in 30.36% of eyes, while against-the-rule was found in 52.41% of eyes. The percentage of against-the-rule astigmatism increased with age. <italic>Conclusion</italic>. Our study showed that almost one-half of preoperative eyes (47.27%) in northern China have a corneal astigmatism of 1.0 D or more, indicating that more surgical techniques or toric IOLs are needed to achieve better visual rehabilitation.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Koch, Dd" uniqKey="Koch D">DD Koch</name></author><author><name sortKey="Ali, Sf" uniqKey="Ali S">SF Ali</name></author><author><name sortKey="Weikert, Mp" uniqKey="Weikert M">MP Weikert</name></author><author><name sortKey="Shirayama, M" uniqKey="Shirayama M">M Shirayama</name></author><author><name sortKey="Jenkins, R" uniqKey="Jenkins R">R Jenkins</name></author><author><name sortKey="Wang, L" uniqKey="Wang L">L Wang</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Wang, L" uniqKey="Wang L">L Wang</name></author><author><name sortKey="Hill, We" uniqKey="Hill W">WE Hill</name></author><author><name sortKey="Koch, Dd" uniqKey="Koch D">DD Koch</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Wang, L" uniqKey="Wang L">L Wang</name></author><author><name sortKey="Mahmoud, Am" uniqKey="Mahmoud A">AM Mahmoud</name></author><author><name sortKey="Anderson, Bl" uniqKey="Anderson B">BL Anderson</name></author><author><name sortKey="Koch, Dd" uniqKey="Koch D">DD Koch</name></author><author><name sortKey="Roberts, Cj" uniqKey="Roberts C">CJ Roberts</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Nichamin, Ld" uniqKey="Nichamin L">LD Nichamin</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Khan, Mi" uniqKey="Khan M">MI Khan</name></author><author><name sortKey="Muhtaseb, M" uniqKey="Muhtaseb M">M Muhtaseb</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Park, Yc" uniqKey="Park Y">YC Park</name></author><author><name sortKey="Do, Jr" uniqKey="Do J">JR Do</name></author><author><name sortKey="Chuck, Rs" uniqKey="Chuck R">RS Chuck</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ferrer Blasco, T" uniqKey="Ferrer Blasco T">T Ferrer-Blasco</name></author><author><name sortKey="Montes Mic, R" uniqKey="Montes Mic R">R Montés-Micó</name></author><author><name sortKey="Peixoto De Matos, Sc" uniqKey="Peixoto De Matos S">SC Peixoto-de-Matos</name></author><author><name sortKey="Gonzalez Meijome, Jm" uniqKey="Gonzalez Meijome J">JM González-Méijome</name></author><author><name sortKey="Cervi O, A" uniqKey="Cervi O A">A Cerviño</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Chen, W" uniqKey="Chen W">W Chen</name></author><author><name sortKey="Zuo, C" uniqKey="Zuo C">C Zuo</name></author><author><name sortKey="Chen, C" uniqKey="Chen C">C Chen</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lekhanont, K" uniqKey="Lekhanont K">K Lekhanont</name></author><author><name sortKey="Wuthisiri, W" uniqKey="Wuthisiri W">W Wuthisiri</name></author><author><name sortKey="Chatchaipun, P" uniqKey="Chatchaipun P">P Chatchaipun</name></author><author><name sortKey="Vongthongsri, A" uniqKey="Vongthongsri A">A Vongthongsri</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ercegovi, A" uniqKey="Ercegovi A">A Ercegović</name></author><author><name sortKey="Brajkovi, J" uniqKey="Brajkovi J">J Brajković</name></author><author><name sortKey="Sura, Ik" uniqKey="Sura I">IK Surać</name></author><author><name sortKey="Haluzan, Mb" uniqKey="Haluzan M">MB Haluzan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Zhao, J" uniqKey="Zhao J">J Zhao</name></author><author><name sortKey="Ellwein, Lb" uniqKey="Ellwein L">LB Ellwein</name></author><author><name sortKey="Cui, H" uniqKey="Cui H">H Cui</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Guan, Z" uniqKey="Guan Z">Z Guan</name></author><author><name sortKey="Yuan, F" uniqKey="Yuan F">F Yuan</name></author><author><name sortKey="Yuan, Y Z" uniqKey="Yuan Y">Y-Z Yuan</name></author><author><name sortKey="Niu, W R" uniqKey="Niu W">W-R Niu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Nemeth, G" uniqKey="Nemeth G">G Nemeth</name></author><author><name sortKey="Szalai, E" uniqKey="Szalai E">E Szalai</name></author><author><name sortKey="Berta, A" uniqKey="Berta A">A Berta</name></author><author><name sortKey="Modis, Lj" uniqKey="Modis L">LJ Modis</name></author><author><name sortKey="Modis, L" uniqKey="Modis L">L Modis</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="De Bernardo, M" uniqKey="De Bernardo M">M De Bernardo</name></author><author><name sortKey="Zeppa, L" uniqKey="Zeppa L">L Zeppa</name></author><author><name sortKey="Cennamo, M" uniqKey="Cennamo M">M Cennamo</name></author><author><name sortKey="Iaccarino, S" uniqKey="Iaccarino S">S Iaccarino</name></author><author><name sortKey="Rosa, N" uniqKey="Rosa N">N Rosa</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hoffmann, Pc" uniqKey="Hoffmann P">PC Hoffmann</name></author><author><name sortKey="Hutz, Ww" uniqKey="Hutz W">WW Hütz</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hayashi, K" uniqKey="Hayashi K">K Hayashi</name></author><author><name sortKey="Hayashi, H" uniqKey="Hayashi H">H Hayashi</name></author><author><name sortKey="Hayashi, F" uniqKey="Hayashi F">F Hayashi</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ouchi, M" uniqKey="Ouchi M">M Ouchi</name></author><author><name sortKey="Kinoshita, S" uniqKey="Kinoshita S">S Kinoshita</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Qammar, A" uniqKey="Qammar A">A Qammar</name></author><author><name sortKey="Mullaney, P" uniqKey="Mullaney P">P Mullaney</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Norouzi, H" uniqKey="Norouzi H">H Norouzi</name></author><author><name sortKey="Rahmati Kamel, M" uniqKey="Rahmati Kamel M">M Rahmati-Kamel</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Gunvant, P" uniqKey="Gunvant P">P Gunvant</name></author><author><name sortKey="Ablamowicz, A" uniqKey="Ablamowicz A">A Ablamowicz</name></author><author><name sortKey="Gollamudi, S" uniqKey="Gollamudi S">S Gollamudi</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kim, P" uniqKey="Kim P">P Kim</name></author><author><name sortKey="Sutton, Gl" uniqKey="Sutton G">GL Sutton</name></author><author><name sortKey="Rootman, Ds" uniqKey="Rootman D">DS Rootman</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ruckl, T" uniqKey="Ruckl T">T Rückl</name></author><author><name sortKey="Dexl, Ak" uniqKey="Dexl A">AK Dexl</name></author><author><name sortKey="Bachernegg, A" uniqKey="Bachernegg A">A Bachernegg</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Mendicute, J" uniqKey="Mendicute J">J Mendicute</name></author><author><name sortKey="Irigoyen, C" uniqKey="Irigoyen C">C Irigoyen</name></author><author><name sortKey="Ruiz, M" uniqKey="Ruiz M">M Ruiz</name></author><author><name sortKey="Illarramendi, I" uniqKey="Illarramendi I">I Illarramendi</name></author><author><name sortKey="Ferrer Blasco, T" uniqKey="Ferrer Blasco T">T Ferrer-Blasco</name></author><author><name sortKey="Montes Mic, R" uniqKey="Montes Mic R">R Montés-Micó</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Horn, Jd" uniqKey="Horn J">JD Horn</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Bachernegg, A" uniqKey="Bachernegg A">A Bachernegg</name></author><author><name sortKey="Ruckl, T" uniqKey="Ruckl T">T Rückl</name></author><author><name sortKey="Riha, W" uniqKey="Riha W">W Riha</name></author><author><name sortKey="Grabner, G" uniqKey="Grabner G">G Grabner</name></author><author><name sortKey="Dexl, Ak" uniqKey="Dexl A">AK Dexl</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Gross, Rh" uniqKey="Gross R">RH Gross</name></author><author><name sortKey="Miller, Km" uniqKey="Miller K">KM Miller</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Buzzonetti, L" uniqKey="Buzzonetti L">L Buzzonetti</name></author><author><name sortKey="Petrocelli, G" uniqKey="Petrocelli G">G Petrocelli</name></author><author><name sortKey="Laborante, A" uniqKey="Laborante A">A Laborante</name></author><author><name sortKey="Mazzilli, E" uniqKey="Mazzilli E">E Mazzilli</name></author><author><name sortKey="Gaspari, M" uniqKey="Gaspari M">M Gaspari</name></author><author><name sortKey="Valente, P" uniqKey="Valente P">P Valente</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Abbey, A" uniqKey="Abbey A">A Abbey</name></author><author><name sortKey="Ide, T" uniqKey="Ide T">T Ide</name></author><author><name sortKey="Kymionis, Gd" uniqKey="Kymionis G">GD Kymionis</name></author><author><name sortKey="Yoo, Sh" uniqKey="Yoo S">SH Yoo</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kumar, Nl" uniqKey="Kumar N">NL Kumar</name></author><author><name sortKey="Kaiserman, I" uniqKey="Kaiserman I">I Kaiserman</name></author><author><name sortKey="Shehadeh Mashor, R" uniqKey="Shehadeh Mashor R">R Shehadeh-Mashor</name></author><author><name sortKey="Sansanayudh, W" uniqKey="Sansanayudh W">W Sansanayudh</name></author><author><name sortKey="Ritenour, R" uniqKey="Ritenour R">R Ritenour</name></author><author><name sortKey="Rootman, Ds" uniqKey="Rootman D">DS Rootman</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Bahar, I" uniqKey="Bahar I">I Bahar</name></author><author><name sortKey="Levinger, E" uniqKey="Levinger E">E Levinger</name></author><author><name sortKey="Kaiserman, I" uniqKey="Kaiserman I">I Kaiserman</name></author><author><name sortKey="Sansanayudh, W" uniqKey="Sansanayudh W">W Sansanayudh</name></author><author><name sortKey="Rootman, Ds" uniqKey="Rootman D">DS Rootman</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Shimizu, K" uniqKey="Shimizu K">K Shimizu</name></author><author><name sortKey="Misawa, A" uniqKey="Misawa A">A Misawa</name></author><author><name sortKey="Suzuki, Y" uniqKey="Suzuki Y">Y Suzuki</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Visser, N" uniqKey="Visser N">N Visser</name></author><author><name sortKey="Berendschot, Ttjm" uniqKey="Berendschot T">TTJM Berendschot</name></author><author><name sortKey="Bauer, Njc" uniqKey="Bauer N">NJC Bauer</name></author><author><name sortKey="Nuijts, Rmma" uniqKey="Nuijts R">RMMA Nuijts</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Toto, L" uniqKey="Toto L">L Toto</name></author><author><name sortKey="Vecchiarino, L" uniqKey="Vecchiarino L">L Vecchiarino</name></author><author><name sortKey="D Go, E" uniqKey="D Go E">E D’Ugo</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Mendicute, J" uniqKey="Mendicute J">J Mendicute</name></author><author><name sortKey="Irigoyen, C" uniqKey="Irigoyen C">C Irigoyen</name></author><author><name sortKey="Aramberri, J" uniqKey="Aramberri J">J Aramberri</name></author><author><name sortKey="Ondarra, A" uniqKey="Ondarra A">A Ondarra</name></author><author><name sortKey="Montes Mic, R" uniqKey="Montes Mic R">R Montés-Micó</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="De Silva, Dj" uniqKey="De Silva D">DJ De Silva</name></author><author><name sortKey="Ramkissoon, Yd" uniqKey="Ramkissoon Y">YD Ramkissoon</name></author><author><name sortKey="Bloom, Pa" uniqKey="Bloom P">PA Bloom</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Goto, T" uniqKey="Goto T">T Goto</name></author><author><name sortKey="Klyce, Sd" uniqKey="Klyce S">SD Klyce</name></author><author><name sortKey="Zheng, X" uniqKey="Zheng X">X Zheng</name></author><author><name sortKey="Maeda, N" uniqKey="Maeda N">N Maeda</name></author><author><name sortKey="Kuroda, T" uniqKey="Kuroda T">T Kuroda</name></author><author><name sortKey="Ide, C" uniqKey="Ide C">C Ide</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Gudmundsdottir, E" uniqKey="Gudmundsdottir E">E Gudmundsdottir</name></author><author><name sortKey="Arnarsson, A" uniqKey="Arnarsson A">A Arnarsson</name></author><author><name sortKey="Jonasson, F" uniqKey="Jonasson F">F Jonasson</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Montes Mico, R" uniqKey="Montes Mico R">R Montes-Mico</name></author><author><name sortKey="Ferrer Blasco, T" uniqKey="Ferrer Blasco T">T Ferrer-Blasco</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ferrer Blasco, T" uniqKey="Ferrer Blasco T">T Ferrer-Blasco</name></author><author><name sortKey="Gonzalez Meijome, Jm" uniqKey="Gonzalez Meijome J">JM González-Méijome</name></author><author><name sortKey="Montes Mic, R" uniqKey="Montes Mic R">R Montés-Micó</name></author></analytic></biblStruct></listBibl></div1></back></TEI><pmc article-type="other"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">J Ophthalmol</journal-id><journal-id journal-id-type="iso-abbrev">J Ophthalmol</journal-id><journal-id journal-id-type="publisher-id">JOPH</journal-id><journal-title-group><journal-title>Journal of Ophthalmology</journal-title></journal-title-group><issn pub-type="ppub">2090-004X</issn><issn pub-type="epub">2090-0058</issn><publisher><publisher-name>Hindawi Publishing Corporation</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">24991429</article-id><article-id pub-id-type="pmc">4060487</article-id><article-id pub-id-type="doi">10.1155/2014/536412</article-id><article-categories><subj-group subj-group-type="heading"><subject>Clinical Study</subject></subj-group></article-categories><title-group><article-title>Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China</article-title></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">http://orcid.org/0000-0002-0204-8361</contrib-id><name><surname>Yuan</surname><given-names>Xiaoyong</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Song</surname><given-names>Hui</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Peng</surname><given-names>Gang</given-names></name><xref ref-type="aff" rid="I2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Hua</surname><given-names>Xia</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">http://orcid.org/0000-0002-1922-6216</contrib-id><name><surname>Tang</surname><given-names>Xin</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref><xref ref-type="corresp" rid="cor1">*</xref></contrib></contrib-group><aff id="I1"><sup>1</sup>Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Clinical College of Ophthalmology, Tianjin Medical University, No. 4 Gansu Road, Heping District, Tianjin 300020, China</aff><aff id="I2"><sup>2</sup>Department of Bioinformatics and Computational Biology, University of Texas, MD Anderson Cancer Center, Houston, TX 77030, USA</aff><author-notes><corresp id="cor1">*Xin Tang: <email>tangprofessor@aliyun.com</email></corresp><fn fn-type="other"><p>Academic Editor: Suddhasil Mookherjee</p></fn></author-notes><pub-date pub-type="ppub"><year>2014</year></pub-date><pub-date pub-type="epub"><day>3</day><month>6</month><year>2014</year></pub-date><volume>2014</volume><elocation-id>536412</elocation-id><history><date date-type="received"><day>7</day><month>2</month><year>2014</year></date><date date-type="rev-recd"><day>26</day><month>4</month><year>2014</year></date><date date-type="accepted"><day>19</day><month>5</month><year>2014</year></date></history><permissions><copyright-statement>Copyright © 2014 Xiaoyong Yuan et al.</copyright-statement><copyright-year>2014</copyright-year><license license-type="open-access"><license-p>This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p><italic>Purpose</italic>. To analyze the prevalence and presentation patterns of corneal astigmatism in cataract surgery candidates in a teaching hospital in northern China. <italic>Methods</italic>. From May 1, 2012, to April 30, 2013, partial coherence interferometry (IOLMaster) measurements of all qualified cataract surgery candidates were retrospectively collected and analyzed. <italic>Results</italic>. The study evaluated 12,449 eyes from 6,908 patients with a mean age of 69.80 ± 11.15 (SD) years. The corneal astigmatism was 0.5 diopters (D) or less in 20.76% of eyes, 1.0 D or more in 47.27% of eyes, 2.0 D or more in 13.16% of eyes, and 3.0 D or more in 3.75% of eyes. With-the-rule astigmatism was found in 30.36% of eyes, while against-the-rule was found in 52.41% of eyes. The percentage of against-the-rule astigmatism increased with age. <italic>Conclusion</italic>. Our study showed that almost one-half of preoperative eyes (47.27%) in northern China have a corneal astigmatism of 1.0 D or more, indicating that more surgical techniques or toric IOLs are needed to achieve better visual rehabilitation.</p></abstract><funding-group><award-group><funding-source>Key Projects of the Bureau of Health, Tianjin</funding-source><award-id>2012KR17</award-id></award-group><award-group><funding-source>Key Projects of the Bureau of Health, Tianjin</funding-source><award-id>10KG108</award-id></award-group></funding-group></article-meta></front><body><sec id="sec1"><title>1. Introduction</title><p>Phacoemulsification is one of the most successfully and commonly performed cataract surgeries worldwide. With the development of modern surgical techniques and intraocular lenses (IOLs), patients expect and demand refractive error correction after cataract surgery. Advances in the calculation of IOL power have significantly reduced the incidence of spherical refractive errors, while residual astigmatism after surgery is a concern for both ophthalmologists and patients and can leave patients with symptomatic decreased visual function [<xref rid="B1" ref-type="bibr">1</xref>–<xref rid="B5" ref-type="bibr">5</xref>].</p><p>Partial coherence interferometry (IOLMaster, Carl Zeiss Meditec, Berlin, Germany) is widely used due to its superior performance in the measurement of ocular axial length. The IOLMaster analyzes six light reflections projected onto the anterior corneal surface within a 2.3 mm radius and can also be used as an automated keratometer (AK). Recent reports have shown that IOLMaster can precisely measure preoperative corneal astigmatism and can predict the residual corneal astigmatism after cataract surgery [<xref rid="B6" ref-type="bibr">6</xref>].</p><p>The distribution and prevalence of corneal astigmatism in cataract patients of different countries have been previously reported [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B7" ref-type="bibr">7</xref>–<xref rid="B10" ref-type="bibr">10</xref>]. An estimated 13,780,000 cases of blindness have been caused by cataracts in China [<xref rid="B11" ref-type="bibr">11</xref>] and two groups from Guangzhou [<xref rid="B8" ref-type="bibr">8</xref>] and Shanghai [<xref rid="B12" ref-type="bibr">12</xref>] have reported the distribution of corneal astigmatism before cataract surgery in southern and central China. However, there are no similar reports for cataract patients in northern China. This study reviewed all of the cataract cases in one year in one of the largest eye hospitals in China to investigate the prevalence of corneal astigmatism in a large sample in northern China. The findings may aid hospitals and manufacturing companies in evaluating the requirement for the use of toric IOLs or other reported surgical methods.</p></sec><sec id="sec2"><title>2. Patients and Methods</title><p>Retrospective biometry data were collected for all patients who had routine cataract surgery at the Tianjin Eye Hospital between May 1, 2012, and April 30, 2013. Cataract patients with a history of ocular surgery, corneal disease, and inflammation and with an age younger than 30 years old and a dense cataract that did not allow IOLMaster measurement were excluded. Routine eye examinations were performed before operation, including visual acuity, refraction, tonometry, slit lamp evaluation, and dilated fundus examination. The study was approved by the Human Research Ethics Committee at the Tianjin Eye Hospital and all procedures adhered to the tenets of the Declaration of Helsinki. All patients provided written informed consent. Three experienced technicians collected the keratometric data for consecutive patients using IOLMaster version 5.3 and the mean of five measurements was used for the parameters.</p><p>Data were analyzed by the R software package version 2.15.2 R Core Team (R Foundation for Statistical Computing, Vienna, Austria, ISBN 3-900051-07-0, URL <ext-link ext-link-type="uri" xlink:href="http://www.R-project.org/">http://www.R-project.org/</ext-link>). The Kolmogorov-Smirnov test was used to evaluate the normal distribution of variables. The results showed that the data were normally distributed, except for the data regarding astigmatisms. One-way analysis of variance and the Kruskal-Wallis test were applied for the comparison of variance for normally and nonnormally distributed data among different age groups, respectively. The <italic>t</italic>-test was used to compare keratometry between the two groups and a Wilcoxon signed rank test was used to compare corneal astigmatism data. Spearman's rank test was used to assess the relationship between age and astigmatism. A <italic>P</italic> value less than 0.05 was considered statistically significant.</p></sec><sec id="sec3"><title>3. Results</title><p>This study was composed of 12,449 eyes from 6,908 patients. The patient demographics are shown in <xref ref-type="table" rid="tab1">Table 1</xref>, which also shows a comparison of 5 other published papers. <xref ref-type="fig" rid="fig1"> Figure 1</xref> presents a histogram of the frequency distribution of corneal astigmatism. Among all of the patients, astigmatism of 0.51 to 1.00 D was the most common cylinder value (32.54%), followed by 1.01 to 1.50 D (21.29%) and 0.0 to 0.50 D (20.76%). In total, 3200 eyes (25.41%) exhibited a corneal astigmatism of 1.5 D or greater.</p><p><xref ref-type="table" rid="tab2">Table 2</xref> presents the descriptive flat keratometry (K1) and steep keratometry (K2) in the 7 age groups. A gradually increasing keratometry value was observed with age, particularly in K2. Most eyes in this cohort were between 71 and 80 years old, which represented more than one-third (36.28%) of all cases. Patients between 61 and 70 years old represented one-fourth (25.91%) of all cases.</p><p><xref ref-type="fig" rid="fig2">Figure 2</xref> shows the corneal astigmatism values in each age group. Spearman's rank correlation between age and astigmatism was <italic>r</italic> = 0.12 with <italic>P</italic> < 0.001. <xref ref-type="fig" rid="fig3"> Figure 3</xref> depicts the distributions of corneal astigmatism in the different age groups.</p><p>With-the-rule (WTR, the steep meridian of the cornea being within 90 ± 30 degrees) corneal astigmatism was found in 3779 eyes (30.36%), against-the-rule (ATR, the steep meridian of the cornea being within 180 ± 30 degrees) corneal astigmatism was found in 6524 eyes (52.41%), and oblique (neither WTR nor ATR) corneal astigmatism was found in 2146 eyes (17.22%). The ATR astigmatism proportion increased with age and the WTR astigmatism proportion decreased with age, except in the 30–40-year-old age group, which showed a slightly higher percentage of ATR astigmatism (<xref ref-type="fig" rid="fig4">Figure 4</xref>).</p><p>No significant difference was found between the right and left eyes in K1 (43.91 ± 1.76 versus 43.94 ± 1.66, <italic>t</italic> = 0.75, <italic>P</italic> = 0.45) or K2 (45.08 ± 1.73 versus 45.06 ± 1.72, <italic>t</italic> = 0.66, <italic>P</italic> = 0.51). A statistically significant difference was found between right and left eye corneal astigmatisms with the Wilcoxon signed rank test (1.17 ± 0.85 D versus 1.13 ± 0.82 D, statistic = 19840457, <italic>P</italic> = 0.02).</p><p>The K1 and K2 values in females were higher than those in males (K1: 44.11 ± 1.67 versus 43.71 ± 1.74, <italic>t</italic> = 13.20, <italic>P</italic> < 0.0001; K2: 45.30 ± 1.72 versus 44.82 ± 1.80, <italic>t</italic> = 15.34, <italic>P</italic> < 0.0001). The corneal astigmatism in females was significantly greater than that in males according to the Wilcoxon signed rank test (1.19 ± 0.87 versus. 1.11 ± 0.80, statistic = 18500144, <italic>P</italic> < 0.0001).</p></sec><sec id="sec4"><title>4. Discussion</title><p>This study determined the distribution of corneal astigmatism in different age groups in northern China. Several studies have investigated the prevalence of corneal astigmatism using IOLMaster [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B7" ref-type="bibr">7</xref>, <xref rid="B9" ref-type="bibr">9</xref>, <xref rid="B12" ref-type="bibr">12</xref>–<xref rid="B14" ref-type="bibr">14</xref>], which not only affords the measurement of corneal status but also enables the easy and reliable calculation of IOLs as well as postoperative refraction data. The IOLMaster database was accessed for all cataract candidates in an entire year. The results showed that the mean age was slightly younger than previously reported data [<xref rid="B8" ref-type="bibr">8</xref>, <xref rid="B12" ref-type="bibr">12</xref>] and that the 71–80-year-old age group occupied 36.28% of all cases, followed by the 61–70-year-old age group (25.91%) and the 81–90-year-old age group (16.01%); these results were similar to those of Chen et al. report from Guangzhou [<xref rid="B8" ref-type="bibr">8</xref>] but differed from those of Khan and Muhtaseb's report [<xref rid="B5" ref-type="bibr">5</xref>]. Khan et al. reported that the 71–80-year-old age group was the largest, followed by the 81–90- and 61–70-year-old age groups [<xref rid="B5" ref-type="bibr">5</xref>]. In terms of gender distribution, our study showed that the number of female patients was greater than that of males, which is consistent with other published studies [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B7" ref-type="bibr">7</xref>, <xref rid="B8" ref-type="bibr">8</xref>, <xref rid="B12" ref-type="bibr">12</xref>].</p><p>ATR astigmatism was the predominant group, comprising 52.41% of the cases, and the prevalence increased with age, except for the 30–40-year-old age group, which showed a slightly higher percentage than the 41–50-year-old age group. Selection bias may account for this finding because the 30–40-year-old age group represented only 1.32% of all cases. By contrast, the percentage of WTR astigmatism decreased with age. These findings are generally consistent with those of previous studies [<xref rid="B7" ref-type="bibr">7</xref>, <xref rid="B13" ref-type="bibr">13</xref>, <xref rid="B15" ref-type="bibr">15</xref>, <xref rid="B16" ref-type="bibr">16</xref>].</p><p>The mean corneal astigmatism of this cohort was 1.15 ± 0.84 D (range from 0.0 to 6.84 D), which is slightly higher than that in other published studies [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B7" ref-type="bibr">7</xref>, <xref rid="B8" ref-type="bibr">8</xref>, <xref rid="B12" ref-type="bibr">12</xref>, <xref rid="B15" ref-type="bibr">15</xref>]. The right (1.17 D) and left eyes (1.13 D) significantly differed, which is in contrast to the findings of Hoffmann and Hütz's study [<xref rid="B15" ref-type="bibr">15</xref>]. Interestingly, the corneal astigmatism in females (1.19 D) was significantly greater than that in males (1.11 D).</p><p>In our study, 20.76% of eyes had a corneal astigmatism of 0.5 D or less, which is lower than the results from other groups [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B7" ref-type="bibr">7</xref>, <xref rid="B8" ref-type="bibr">8</xref>, <xref rid="B12" ref-type="bibr">12</xref>]. A large proportion of eyes (47.27%) had a corneal astigmatism of 1.0 D or greater, which is higher than the results reported by the abovementioned groups. Additionally, 3.75% of eyes had 3.0 D of corneal astigmatism [<xref rid="B8" ref-type="bibr">8</xref>, <xref rid="B12" ref-type="bibr">12</xref>], which is a greater prevalence than that reported by the other two Chinese studies (2.22%, 3.52%) but is lower than that reported by European studies (5.61%, 4.61%) [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B7" ref-type="bibr">7</xref>]. All age groups showed a similar distribution pattern of corneal astigmatism, except for the 30–40- and above 91-year-old age groups, which showed some variation in the astigmatism distribution. A previous study showed a similar distribution pattern [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B7" ref-type="bibr">7</xref>].</p><p>Several techniques exist to correct corneal astigmatism, including limbal relaxing incisions [<xref rid="B17" ref-type="bibr">17</xref>], opposite clear corneal incisions [<xref rid="B18" ref-type="bibr">18</xref>], excimer laser refractive procedures [<xref rid="B19" ref-type="bibr">19</xref>, <xref rid="B20" ref-type="bibr">20</xref>], femtosecond laser-assisted astigmatic keratotomy [<xref rid="B21" ref-type="bibr">21</xref>, <xref rid="B22" ref-type="bibr">22</xref>], and toric intraocular lens (IOL) implantation [<xref rid="B23" ref-type="bibr">23</xref>–<xref rid="B25" ref-type="bibr">25</xref>]. The procedure chosen primarily depends on the precise measurements of preoperative corneal astigmatism.</p><p>A clear corneal incision may result in a surgically induced corneal astigmatism in patients with 0.5 D [<xref rid="B26" ref-type="bibr">26</xref>]. In our study, 53.30% of eyes had a corneal astigmatism of 1.0 D or less and received sufficient correction through the performance of on-axis phacoemulsification combined with monofocal IOL implantation [<xref rid="B5" ref-type="bibr">5</xref>]. Meanwhile, 23.41% of eyes exhibited more than 1.50 D of corneal astigmatism in our study, which is similar to the findings of Khan et al. (20.5%) [<xref rid="B5" ref-type="bibr">5</xref>] and Ferrer-Blasco et al. (22%) [<xref rid="B7" ref-type="bibr">7</xref>], although their studies required more manipulations or techniques to correct for better visual rehabilitation. Other techniques, such as manual or femtosecond laser-assisted arcuate keratotomy, were used to correct much worse corneal astigmatisms [<xref rid="B27" ref-type="bibr">27</xref>, <xref rid="B28" ref-type="bibr">28</xref>]. Recently, limbal femtosecond laser-assisted intrastromal arcuate keratotomy has been used for corneal astigmatisms of 1.50 ± 0.47 D [<xref rid="B22" ref-type="bibr">22</xref>]. However, the results of this procedure are unpredictable or are associated with complications [<xref rid="B29" ref-type="bibr">29</xref>, <xref rid="B30" ref-type="bibr">30</xref>]. Considering the high cost of femtosecond laser surgery, the majority of the population in China cannot afford such procedures.</p><p>Toric IOLs have been used clinically since they were first described by Shimizu et al. [<xref rid="B31" ref-type="bibr">31</xref>], with encouraging results [<xref rid="B32" ref-type="bibr">32</xref>–<xref rid="B35" ref-type="bibr">35</xref>]. An analysis of the distribution of corneal astigmatism in a large cohort of cataract candidates will provide valuable information and benefits for manufacturers, ophthalmologists, and cataract patients. At present, toric IOLs can be used to correct corneal astigmatisms from 0.4 D to 8.4 D [<xref rid="B7" ref-type="bibr">7</xref>] during cataract surgery. In our case series, 1.51 D to 3.50 D represented 23.37% of all cases, most of which could be effectively corrected with toric IOLs. The higher cost of new IOLs may be another burden for patients and health insurance companies.</p><p>Corneal astigmatism changes significantly with age [<xref rid="B15" ref-type="bibr">15</xref>, <xref rid="B36" ref-type="bibr">36</xref>–<xref rid="B39" ref-type="bibr">39</xref>]. Our study and the two previous Chinese investigations support this tendency [<xref rid="B8" ref-type="bibr">8</xref>, <xref rid="B12" ref-type="bibr">12</xref>]. The mean values of K1, K2, corneal astigmatism, and other parameters in our study were slightly higher than those reported by some other studies [<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B7" ref-type="bibr">7</xref>] but closely resemble those from reports from Shanghai [<xref rid="B12" ref-type="bibr">12</xref>] and Guangzhou [<xref rid="B8" ref-type="bibr">8</xref>], China. Possible reasons may be the inclusion of different racial and ethnic groups, different inclusion criteria, and different age distributions, among others. Our retrospective study was clinically based, which may lead to some selection bias. One advantage of our study is that we selected all of the cataract surgery candidates from an entire year, which presented more than one-half of cataract surgery cases in the same year in Tianjin, a city with 12,280,000 people <ext-link ext-link-type="uri" xlink:href="http://en.wikipedia.org/wiki/Tianjin">http://en.wikipedia.org/wiki/Tianjin</ext-link>.</p><p>In conclusion, our study revealed the distribution of all cataract candidates in one year in a single hospital in northern China. A number of our cases (47.27%) exhibited a corneal astigmatism of 1.0 D or more. Corneal astigmatism increases with age. With an aging population and a higher demand for improved vision, the need for astigmatism correction with toric IOLs or other methods will increase accordingly.</p></sec></body><back><ack><title>Acknowledgment</title><p>This study was supported by the Key Projects of the Bureau of Health, Tianjin (2012KR17, 10KG108).</p></ack><sec sec-type="conflict"><title>Conflict of Interests</title><p>The authors report no conflict of interests. The authors alone are responsible for the content and writing of this paper.</p></sec><sec><title>Authors' Contribution</title><p>Xiaoyong Yuan and Hui Song contributed equally to this work and should be considered as co-first authors.</p></sec><ref-list><ref id="B1"><label>1</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Koch</surname><given-names>DD</given-names></name><name><surname>Ali</surname><given-names>SF</given-names></name><name><surname>Weikert</surname><given-names>MP</given-names></name><name><surname>Shirayama</surname><given-names>M</given-names></name><name><surname>Jenkins</surname><given-names>R</given-names></name><name><surname>Wang</surname><given-names>L</given-names></name></person-group><article-title>Contribution of posterior corneal astigmatism to total corneal astigmatism</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2012</year><volume>38</volume><issue>12</issue><fpage>2080</fpage><lpage>2087</lpage><pub-id pub-id-type="other">2-s2.0-84870292472</pub-id><pub-id pub-id-type="pmid">23069271</pub-id></element-citation></ref><ref id="B2"><label>2</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Wang</surname><given-names>L</given-names></name><name><surname>Hill</surname><given-names>WE</given-names></name><name><surname>Koch</surname><given-names>DD</given-names></name></person-group><article-title>Evaluation of intraocular lens power prediction methods using the American Society of Cataract and Refractive Surgeons Post-Keratorefractive Intraocular Lens Power Calculator</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2010</year><volume>36</volume><issue>9</issue><fpage>1466</fpage><lpage>1473</lpage><pub-id pub-id-type="other">2-s2.0-77955590018</pub-id><pub-id pub-id-type="pmid">20692556</pub-id></element-citation></ref><ref id="B3"><label>3</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Wang</surname><given-names>L</given-names></name><name><surname>Mahmoud</surname><given-names>AM</given-names></name><name><surname>Anderson</surname><given-names>BL</given-names></name><name><surname>Koch</surname><given-names>DD</given-names></name><name><surname>Roberts</surname><given-names>CJ</given-names></name></person-group><article-title>Total corneal power estimation: ray tracing method versus Gaussian optics formula</article-title><source><italic>Investigative Ophthalmology and Visual Science</italic></source><year>2011</year><volume>52</volume><issue>3</issue><fpage>1716</fpage><lpage>1722</lpage><pub-id pub-id-type="other">2-s2.0-79955940554</pub-id><pub-id pub-id-type="pmid">21071742</pub-id></element-citation></ref><ref id="B4"><label>4</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Nichamin</surname><given-names>LD</given-names></name></person-group><article-title>Astigmatism Control</article-title><source><italic>Ophthalmology Clinics of North America</italic></source><year>2006</year><volume>19</volume><issue>4</issue><fpage>485</fpage><lpage>493</lpage><pub-id pub-id-type="other">2-s2.0-33750194456</pub-id><pub-id pub-id-type="pmid">17067903</pub-id></element-citation></ref><ref id="B5"><label>5</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Khan</surname><given-names>MI</given-names></name><name><surname>Muhtaseb</surname><given-names>M</given-names></name></person-group><article-title>Prevalence of corneal astigmatism in patients having routine cataract surgery at a teaching hospital in the United Kingdom</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2011</year><volume>37</volume><issue>10</issue><fpage>1751</fpage><lpage>1755</lpage><pub-id pub-id-type="other">2-s2.0-81155160973</pub-id><pub-id pub-id-type="pmid">21840163</pub-id></element-citation></ref><ref id="B6"><label>6</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Park</surname><given-names>YC</given-names></name><name><surname>Do</surname><given-names>JR</given-names></name><name><surname>Chuck</surname><given-names>RS</given-names></name></person-group><article-title>Predicting postoperative astigmatism using Scheimpflug keratometry (Pentacam) and automated keratometry (IOLMaster)</article-title><source><italic>Current Eye Research</italic></source><year>2012</year><volume>37</volume><issue>12</issue><fpage>1091</fpage><lpage>1098</lpage><pub-id pub-id-type="other">2-s2.0-84870281544</pub-id><pub-id pub-id-type="pmid">22916682</pub-id></element-citation></ref><ref id="B7"><label>7</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Ferrer-Blasco</surname><given-names>T</given-names></name><name><surname>Montés-Micó</surname><given-names>R</given-names></name><name><surname>Peixoto-de-Matos</surname><given-names>SC</given-names></name><name><surname>González-Méijome</surname><given-names>JM</given-names></name><name><surname>Cerviño</surname><given-names>A</given-names></name></person-group><article-title>Prevalence of corneal astigmatism before cataract surgery</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2009</year><volume>35</volume><issue>1</issue><fpage>70</fpage><lpage>75</lpage><pub-id pub-id-type="other">2-s2.0-57749184342</pub-id><pub-id pub-id-type="pmid">19101427</pub-id></element-citation></ref><ref id="B8"><label>8</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Chen</surname><given-names>W</given-names></name><name><surname>Zuo</surname><given-names>C</given-names></name><name><surname>Chen</surname><given-names>C</given-names></name><etal></etal></person-group><article-title>Prevalence of corneal astigmatism before cataract surgery in Chinese patients</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2013</year><volume>39</volume><issue>2</issue><fpage>188</fpage><lpage>192</lpage><pub-id pub-id-type="other">2-s2.0-84872780990</pub-id><pub-id pub-id-type="pmid">23141077</pub-id></element-citation></ref><ref id="B9"><label>9</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Lekhanont</surname><given-names>K</given-names></name><name><surname>Wuthisiri</surname><given-names>W</given-names></name><name><surname>Chatchaipun</surname><given-names>P</given-names></name><name><surname>Vongthongsri</surname><given-names>A</given-names></name></person-group><article-title>Prevalence of corneal astigmatism in cataract surgery candidates in Bangkok, Thailand</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2011</year><volume>37</volume><issue>3</issue><fpage>613</fpage><lpage>615</lpage><pub-id pub-id-type="other">2-s2.0-79951897592</pub-id><pub-id pub-id-type="pmid">21333886</pub-id></element-citation></ref><ref id="B10"><label>10</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Ercegović</surname><given-names>A</given-names></name><name><surname>Brajković</surname><given-names>J</given-names></name><name><surname>Surać</surname><given-names>IK</given-names></name><name><surname>Haluzan</surname><given-names>MB</given-names></name></person-group><article-title>Prevalence, distribution and types of corneal astigmatism in cataract surgery patients in Sibenik County</article-title><source><italic>Acta clinica Croatica</italic></source><year>2012</year><volume>51</volume><issue>2</issue><fpage>275</fpage><lpage>278</lpage><pub-id pub-id-type="other">2-s2.0-84871864912</pub-id><pub-id pub-id-type="pmid">23115955</pub-id></element-citation></ref><ref id="B11"><label>11</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Zhao</surname><given-names>J</given-names></name><name><surname>Ellwein</surname><given-names>LB</given-names></name><name><surname>Cui</surname><given-names>H</given-names></name><etal></etal></person-group><article-title>Prevalence and outcomes of cataract surgery in rural China: the China nine-province survey</article-title><source><italic>Ophthalmology</italic></source><year>2010</year><volume>117</volume><issue>11</issue><fpage>2120</fpage><lpage>2128</lpage><pub-id pub-id-type="other">2-s2.0-78049232231</pub-id><pub-id pub-id-type="pmid">20663565</pub-id></element-citation></ref><ref id="B12"><label>12</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Guan</surname><given-names>Z</given-names></name><name><surname>Yuan</surname><given-names>F</given-names></name><name><surname>Yuan</surname><given-names>Y-Z</given-names></name><name><surname>Niu</surname><given-names>W-R</given-names></name></person-group><article-title>Analysis of corneal astigmatism in cataract surgery candidates at a teaching hospital in Shanghai, China</article-title><source><italic>Journal of cataract and refractive surgery</italic></source><year>2012</year><volume>38</volume><issue>11</issue><fpage>1970</fpage><lpage>1977</lpage><pub-id pub-id-type="other">2-s2.0-84874180274</pub-id><pub-id pub-id-type="pmid">23079313</pub-id></element-citation></ref><ref id="B13"><label>13</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Nemeth</surname><given-names>G</given-names></name><name><surname>Szalai</surname><given-names>E</given-names></name><name><surname>Berta</surname><given-names>A</given-names></name><name><surname>Modis</surname><given-names>LJ</given-names></name><name><surname>Modis</surname><given-names>L</given-names><suffix>Jr.</suffix></name></person-group><article-title>Astigmatism prevalence and biometric analysis in normal population</article-title><source><italic>European Journal of Ophthalmology</italic></source><year>2013</year><volume>23</volume><issue>6</issue><fpage>779</fpage><lpage>783</lpage><pub-id pub-id-type="pmid">23640506</pub-id></element-citation></ref><ref id="B14"><label>14</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>De Bernardo</surname><given-names>M</given-names></name><name><surname>Zeppa</surname><given-names>L</given-names></name><name><surname>Cennamo</surname><given-names>M</given-names></name><name><surname>Iaccarino</surname><given-names>S</given-names></name><name><surname>Rosa</surname><given-names>N</given-names></name></person-group><article-title>Prevalence of corneal astigmatism before cataract surgery in Caucasian patients</article-title><source><italic>European Journal of Ophthalmology</italic></source><year>2013</year></element-citation></ref><ref id="B15"><label>15</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Hoffmann</surname><given-names>PC</given-names></name><name><surname>Hütz</surname><given-names>WW</given-names></name></person-group><article-title>Analysis of biometry and prevalence data for corneal astigmatism in 23 239 eyes</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2010</year><volume>36</volume><issue>9</issue><fpage>1479</fpage><lpage>1485</lpage><pub-id pub-id-type="other">2-s2.0-77955578258</pub-id><pub-id pub-id-type="pmid">20692558</pub-id></element-citation></ref><ref id="B16"><label>16</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Hayashi</surname><given-names>K</given-names></name><name><surname>Hayashi</surname><given-names>H</given-names></name><name><surname>Hayashi</surname><given-names>F</given-names></name></person-group><article-title>Topographic analysis of the changes in corneal shape due to aging</article-title><source><italic>Cornea</italic></source><year>1995</year><volume>14</volume><issue>5</issue><fpage>527</fpage><lpage>532</lpage><pub-id pub-id-type="other">2-s2.0-0029116768</pub-id><pub-id pub-id-type="pmid">8536468</pub-id></element-citation></ref><ref id="B17"><label>17</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Ouchi</surname><given-names>M</given-names></name><name><surname>Kinoshita</surname><given-names>S</given-names></name></person-group><article-title>AcrySof IQ Toric IOL implantation combined with limbal relaxing incision during cataract surgery for eyes with astigmatism >2.50 D</article-title><source><italic>Journal of Refractive Surgery</italic></source><year>2011</year><volume>27</volume><issue>9</issue><fpage>643</fpage><lpage>647</lpage><pub-id pub-id-type="other">2-s2.0-80053482083</pub-id><pub-id pub-id-type="pmid">21972447</pub-id></element-citation></ref><ref id="B18"><label>18</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Qammar</surname><given-names>A</given-names></name><name><surname>Mullaney</surname><given-names>P</given-names></name></person-group><article-title>Paired opposite clear corneal incisions to correct preexisting astigmatism in cataract patients</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2005</year><volume>31</volume><issue>6</issue><fpage>1167</fpage><lpage>1170</lpage><pub-id pub-id-type="other">2-s2.0-22544450168</pub-id><pub-id pub-id-type="pmid">16039492</pub-id></element-citation></ref><ref id="B19"><label>19</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Norouzi</surname><given-names>H</given-names></name><name><surname>Rahmati-Kamel</surname><given-names>M</given-names></name></person-group><article-title>Laser in situ keratomileusis for correction of induced astigmatism from cataract surgery</article-title><source><italic>Journal of Refractive Surgery</italic></source><year>2003</year><volume>19</volume><issue>4</issue><fpage>416</fpage><lpage>424</lpage><pub-id pub-id-type="other">2-s2.0-0038443208</pub-id><pub-id pub-id-type="pmid">12899472</pub-id></element-citation></ref><ref id="B20"><label>20</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Gunvant</surname><given-names>P</given-names></name><name><surname>Ablamowicz</surname><given-names>A</given-names></name><name><surname>Gollamudi</surname><given-names>S</given-names></name></person-group><article-title>Predicting the necessity of LASIK enhancement after cataract surgery in patients with multifocal IOL implantation</article-title><source><italic>Clinical Ophthalmology</italic></source><year>2011</year><volume>5</volume><issue>1</issue><fpage>1281</fpage><lpage>1285</lpage><pub-id pub-id-type="other">2-s2.0-81055125662</pub-id><pub-id pub-id-type="pmid">21966202</pub-id></element-citation></ref><ref id="B21"><label>21</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Kim</surname><given-names>P</given-names></name><name><surname>Sutton</surname><given-names>GL</given-names></name><name><surname>Rootman</surname><given-names>DS</given-names></name></person-group><article-title>Applications of the femtosecond laser in corneal refractive surgery</article-title><source><italic>Current Opinion in Ophthalmology</italic></source><year>2011</year><volume>22</volume><issue>4</issue><fpage>238</fpage><lpage>244</lpage><pub-id pub-id-type="other">2-s2.0-79959229667</pub-id><pub-id pub-id-type="pmid">21537186</pub-id></element-citation></ref><ref id="B22"><label>22</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Rückl</surname><given-names>T</given-names></name><name><surname>Dexl</surname><given-names>AK</given-names></name><name><surname>Bachernegg</surname><given-names>A</given-names></name><etal></etal></person-group><article-title>Femtosecond laser-assisted intrastromal arcuate keratotomy to reduce corneal astigmatism</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2013</year><volume>39</volume><issue>4</issue><fpage>528</fpage><lpage>538</lpage><pub-id pub-id-type="other">2-s2.0-84875430169</pub-id><pub-id pub-id-type="pmid">23395324</pub-id></element-citation></ref><ref id="B23"><label>23</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Mendicute</surname><given-names>J</given-names></name><name><surname>Irigoyen</surname><given-names>C</given-names></name><name><surname>Ruiz</surname><given-names>M</given-names></name><name><surname>Illarramendi</surname><given-names>I</given-names></name><name><surname>Ferrer-Blasco</surname><given-names>T</given-names></name><name><surname>Montés-Micó</surname><given-names>R</given-names></name></person-group><article-title>Toric intraocular lens versus opposite clear corneal incisions to correct astigmatism in eyes having cataract surgery</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2009</year><volume>35</volume><issue>3</issue><fpage>451</fpage><lpage>458</lpage><pub-id pub-id-type="other">2-s2.0-61349158136</pub-id><pub-id pub-id-type="pmid">19251137</pub-id></element-citation></ref><ref id="B24"><label>24</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Horn</surname><given-names>JD</given-names></name></person-group><article-title>Status of toric intraocular lenses</article-title><source><italic>Current Opinion in Ophthalmology</italic></source><year>2007</year><volume>18</volume><issue>1</issue><fpage>58</fpage><lpage>61</lpage><pub-id pub-id-type="other">2-s2.0-33845604912</pub-id><pub-id pub-id-type="pmid">17159449</pub-id></element-citation></ref><ref id="B25"><label>25</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Bachernegg</surname><given-names>A</given-names></name><name><surname>Rückl</surname><given-names>T</given-names></name><name><surname>Riha</surname><given-names>W</given-names></name><name><surname>Grabner</surname><given-names>G</given-names></name><name><surname>Dexl</surname><given-names>AK</given-names></name></person-group><article-title>Rotational stability and visual outcome after implantation of a new toric intraocular lens for the correction of corneal astigmatism during cataract surgery</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2013</year><volume>39</volume><issue>9</issue><fpage>1390</fpage><lpage>1398</lpage><pub-id pub-id-type="other">2-s2.0-84883208508</pub-id><pub-id pub-id-type="pmid">23827765</pub-id></element-citation></ref><ref id="B26"><label>26</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Gross</surname><given-names>RH</given-names></name><name><surname>Miller</surname><given-names>KM</given-names></name></person-group><article-title>Corneal astigmatism after phacoemulsification and lens implantation through unsutured scleral and corneal tunnel incisions</article-title><source><italic>American Journal of Ophthalmology</italic></source><year>1996</year><volume>121</volume><issue>1</issue><fpage>57</fpage><lpage>64</lpage><pub-id pub-id-type="other">2-s2.0-0030022743</pub-id><pub-id pub-id-type="pmid">8554081</pub-id></element-citation></ref><ref id="B27"><label>27</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Buzzonetti</surname><given-names>L</given-names></name><name><surname>Petrocelli</surname><given-names>G</given-names></name><name><surname>Laborante</surname><given-names>A</given-names></name><name><surname>Mazzilli</surname><given-names>E</given-names></name><name><surname>Gaspari</surname><given-names>M</given-names></name><name><surname>Valente</surname><given-names>P</given-names></name></person-group><article-title>Arcuate keratotomy for high postoperative keratoplasty astigmatism performed with the intralase femtosecond laser</article-title><source><italic>Journal of Refractive Surgery</italic></source><year>2009</year><volume>25</volume><issue>8</issue><fpage>709</fpage><lpage>714</lpage><pub-id pub-id-type="other">2-s2.0-70449709586</pub-id><pub-id pub-id-type="pmid">19714795</pub-id></element-citation></ref><ref id="B28"><label>28</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Abbey</surname><given-names>A</given-names></name><name><surname>Ide</surname><given-names>T</given-names></name><name><surname>Kymionis</surname><given-names>GD</given-names></name><name><surname>Yoo</surname><given-names>SH</given-names></name></person-group><article-title>Femtosecond laser-assisted astigmatic keratotomy in naturally occurring high astigmatism</article-title><source><italic>British Journal of Ophthalmology</italic></source><year>2009</year><volume>93</volume><issue>12</issue><fpage>1566</fpage><lpage>1569</lpage><pub-id pub-id-type="other">2-s2.0-72449201077</pub-id><pub-id pub-id-type="pmid">19939795</pub-id></element-citation></ref><ref id="B29"><label>29</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Kumar</surname><given-names>NL</given-names></name><name><surname>Kaiserman</surname><given-names>I</given-names></name><name><surname>Shehadeh-Mashor</surname><given-names>R</given-names></name><name><surname>Sansanayudh</surname><given-names>W</given-names></name><name><surname>Ritenour</surname><given-names>R</given-names></name><name><surname>Rootman</surname><given-names>DS</given-names></name></person-group><article-title>IntraLase-enabled astigmatic keratotomy for post-keratoplasty astigmatism: on-axis vector analysis</article-title><source><italic>Ophthalmology</italic></source><year>2010</year><volume>117</volume><issue>6</issue><fpage>1228.e1</fpage><lpage>1235.e1</lpage><pub-id pub-id-type="other">2-s2.0-77952890066</pub-id><pub-id pub-id-type="pmid">20163860</pub-id></element-citation></ref><ref id="B30"><label>30</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Bahar</surname><given-names>I</given-names></name><name><surname>Levinger</surname><given-names>E</given-names></name><name><surname>Kaiserman</surname><given-names>I</given-names></name><name><surname>Sansanayudh</surname><given-names>W</given-names></name><name><surname>Rootman</surname><given-names>DS</given-names></name></person-group><article-title> IntraLase-enabled astigmatic keratotomy for postkeratoplasty astigmatism</article-title><source><italic>American Journal of Ophthalmology</italic></source><year>2008</year><volume>146</volume><issue>6</issue><fpage>897.e1</fpage><lpage>904.e1</lpage><pub-id pub-id-type="other">2-s2.0-56549114289</pub-id><pub-id pub-id-type="pmid">18760767</pub-id></element-citation></ref><ref id="B31"><label>31</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Shimizu</surname><given-names>K</given-names></name><name><surname>Misawa</surname><given-names>A</given-names></name><name><surname>Suzuki</surname><given-names>Y</given-names></name></person-group><article-title>Toric intraocular lenses: correcting astigmatism while controlling axis shift</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>1994</year><volume>20</volume><issue>5</issue><fpage>523</fpage><lpage>526</lpage><pub-id pub-id-type="other">2-s2.0-0027931675</pub-id><pub-id pub-id-type="pmid">7996408</pub-id></element-citation></ref><ref id="B32"><label>32</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Visser</surname><given-names>N</given-names></name><name><surname>Berendschot</surname><given-names>TTJM</given-names></name><name><surname>Bauer</surname><given-names>NJC</given-names></name><name><surname>Nuijts</surname><given-names>RMMA</given-names></name></person-group><article-title>Vector analysis of corneal and refractive astigmatism changes following toric pseudophakic and toric phakic IOL implantation</article-title><source><italic>Investigative Ophthalmology & Visual Science</italic></source><year>2012</year><volume>53</volume><issue>4</issue><fpage>1865</fpage><lpage>1873</lpage><pub-id pub-id-type="other">2-s2.0-84862703007</pub-id><pub-id pub-id-type="pmid">22408012</pub-id></element-citation></ref><ref id="B33"><label>33</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Toto</surname><given-names>L</given-names></name><name><surname>Vecchiarino</surname><given-names>L</given-names></name><name><surname>D’Ugo</surname><given-names>E</given-names></name><etal></etal></person-group><article-title>Astigmatism correction with toric IOL: analysis of visual performance, position, and wavefront error</article-title><source><italic>Journal of Refractive Surgery</italic></source><year>2013</year><volume>29</volume><issue>7</issue><fpage>476</fpage><lpage>483</lpage><pub-id pub-id-type="other">2-s2.0-84879930518</pub-id><pub-id pub-id-type="pmid">23820230</pub-id></element-citation></ref><ref id="B34"><label>34</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Mendicute</surname><given-names>J</given-names></name><name><surname>Irigoyen</surname><given-names>C</given-names></name><name><surname>Aramberri</surname><given-names>J</given-names></name><name><surname>Ondarra</surname><given-names>A</given-names></name><name><surname>Montés-Micó</surname><given-names>R</given-names></name></person-group><article-title>Foldable toric intraocular lens for astigmatism correction in cataract patients</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2008</year><volume>34</volume><issue>4</issue><fpage>601</fpage><lpage>607</lpage><pub-id pub-id-type="other">2-s2.0-40949125167</pub-id><pub-id pub-id-type="pmid">18361982</pub-id></element-citation></ref><ref id="B35"><label>35</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>De Silva</surname><given-names>DJ</given-names></name><name><surname>Ramkissoon</surname><given-names>YD</given-names></name><name><surname>Bloom</surname><given-names>PA</given-names></name></person-group><article-title>Evaluation of a toric intraocular lens with a Z-haptic</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2006</year><volume>32</volume><issue>9</issue><fpage>1492</fpage><lpage>1498</lpage><pub-id pub-id-type="other">2-s2.0-33747612873</pub-id><pub-id pub-id-type="pmid">16931261</pub-id></element-citation></ref><ref id="B36"><label>36</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Goto</surname><given-names>T</given-names></name><name><surname>Klyce</surname><given-names>SD</given-names></name><name><surname>Zheng</surname><given-names>X</given-names></name><name><surname>Maeda</surname><given-names>N</given-names></name><name><surname>Kuroda</surname><given-names>T</given-names></name><name><surname>Ide</surname><given-names>C</given-names></name></person-group><article-title>Gender- and age-related differences in corneal topography</article-title><source><italic>Cornea</italic></source><year>2001</year><volume>20</volume><issue>3</issue><fpage>270</fpage><lpage>276</lpage><pub-id pub-id-type="other">2-s2.0-0035080377</pub-id><pub-id pub-id-type="pmid">11322415</pub-id></element-citation></ref><ref id="B37"><label>37</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Gudmundsdottir</surname><given-names>E</given-names></name><name><surname>Arnarsson</surname><given-names>A</given-names></name><name><surname>Jonasson</surname><given-names>F</given-names></name></person-group><article-title>Five-year refractive changes in an adult population: reykjavik eye study</article-title><source><italic>Ophthalmology</italic></source><year>2005</year><volume>112</volume><issue>4</issue><fpage>672</fpage><lpage>677</lpage><pub-id pub-id-type="other">2-s2.0-16244371029</pub-id><pub-id pub-id-type="pmid">15808261</pub-id></element-citation></ref><ref id="B38"><label>38</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Montes-Mico</surname><given-names>R</given-names></name><name><surname>Ferrer-Blasco</surname><given-names>T</given-names></name></person-group><article-title>Distribution of refractive errors in Spain</article-title><source><italic>Documenta Ophthalmologica</italic></source><year>2000</year><volume>101</volume><issue>1</issue><fpage>25</fpage><lpage>33</lpage><pub-id pub-id-type="other">2-s2.0-0033659871</pub-id><pub-id pub-id-type="pmid">11128966</pub-id></element-citation></ref><ref id="B39"><label>39</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Ferrer-Blasco</surname><given-names>T</given-names></name><name><surname>González-Méijome</surname><given-names>JM</given-names></name><name><surname>Montés-Micó</surname><given-names>R</given-names></name></person-group><article-title>Age-related changes in the human visual system and prevalence of refractive conditions in patients attending an eye clinic</article-title><source><italic>Journal of Cataract and Refractive Surgery</italic></source><year>2008</year><volume>34</volume><issue>3</issue><fpage>424</fpage><lpage>432</lpage><pub-id pub-id-type="other">2-s2.0-41949134115</pub-id><pub-id pub-id-type="pmid">18299067</pub-id></element-citation></ref></ref-list></back><floats-group><fig id="fig1" orientation="portrait" position="float"><label>Figure 1</label><caption><p>Distribution of corneal astigmatism in 0.5 D increments for all 12,449 eyes.</p></caption><graphic xlink:href="JOPH2014-536412.001"></graphic></fig><fig id="fig2" orientation="portrait" position="float"><label>Figure 2</label><caption><p>Corneal cylinder in all 7 age groups. The bold lines in the boxes represent the median (50% percentile), the upper and lower limits of the box represent the first quartile (25% percentile) and third quartile (75% percentile), and the bars represent the minimum and maximum values.</p></caption><graphic xlink:href="JOPH2014-536412.002"></graphic></fig><fig id="fig3" orientation="portrait" position="float"><label>Figure 3</label><caption><p>Frequency distribution of corneal astigmatism in 0.50 D steps for the 7 age groups.</p></caption><graphic xlink:href="JOPH2014-536412.003"></graphic></fig><fig id="fig4" orientation="portrait" position="float"><label>Figure 4</label><caption><p>Percentages of WTR, ATR, and oblique corneal astigmatisms in the 7 groups.</p></caption><graphic xlink:href="JOPH2014-536412.004"></graphic></fig><table-wrap id="tab1" orientation="portrait" position="float"><label>Table 1</label><caption><p>Patient demographics compared with 5 other published studies.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1"> </th><th align="center" rowspan="1" colspan="1">Present</th><th align="center" rowspan="1" colspan="1">Guan et al. [<xref rid="B12" ref-type="bibr">12</xref>]</th><th align="center" rowspan="1" colspan="1">Chen et al. [<xref rid="B8" ref-type="bibr">8</xref>]</th><th align="center" rowspan="1" colspan="1">Ferrer-Blasco et al. [<xref rid="B7" ref-type="bibr">7</xref>]</th><th align="center" rowspan="1" colspan="1">Khan and Muhtaseb [<xref rid="B5" ref-type="bibr">5</xref>]</th><th align="center" rowspan="1" colspan="1">De Bernardo <break></break>et al. [<xref rid="B14" ref-type="bibr">14</xref>]</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">Eyes/patients</td><td align="center" rowspan="1" colspan="1">12449/6908</td><td align="center" rowspan="1" colspan="1">1430/827</td><td align="center" rowspan="1" colspan="1">4831/2849</td><td align="center" rowspan="1" colspan="1">4540/2415</td><td align="center" rowspan="1" colspan="1">1230/746</td><td align="center" rowspan="1" colspan="1">757/380</td></tr><tr><td align="left" rowspan="1" colspan="1">Age (y)</td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td></tr><tr><td align="left" rowspan="1" colspan="1"> Mean ± SD</td><td align="center" rowspan="1" colspan="1">69.80 ± 11.15</td><td align="center" rowspan="1" colspan="1">72.27 ± 11.59</td><td align="center" rowspan="1" colspan="1">70.56 ± 9.55</td><td align="center" rowspan="1" colspan="1">60.59 ± 9.87</td><td align="center" rowspan="1" colspan="1">75.54 ± 0.71</td><td align="center" rowspan="1" colspan="1">71.89 ± 10.19</td></tr><tr><td align="left" rowspan="1" colspan="1"> Range</td><td align="center" rowspan="1" colspan="1">30, 97</td><td align="center" rowspan="1" colspan="1">16, 98</td><td align="center" rowspan="1" colspan="1">49, 95</td><td align="center" rowspan="1" colspan="1">32, 87</td><td align="center" rowspan="1" colspan="1">30, 104</td><td align="center" rowspan="1" colspan="1">33, 96</td></tr><tr><td align="left" rowspan="1" colspan="1">Male/female</td><td align="center" rowspan="1" colspan="1">3199/3709</td><td align="center" rowspan="1" colspan="1">359/468</td><td align="center" rowspan="1" colspan="1">1090/1759</td><td align="center" rowspan="1" colspan="1">768/1647</td><td align="center" rowspan="1" colspan="1">343/403</td><td align="center" rowspan="1" colspan="1">176/204</td></tr><tr><td align="left" rowspan="1" colspan="1">Corneal astigmatism (D)</td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td></tr><tr><td align="left" rowspan="1" colspan="1"> Mean ± SD</td><td align="center" rowspan="1" colspan="1">1.15 ± 0.84</td><td align="center" rowspan="1" colspan="1">1.07 ± 0.73</td><td align="center" rowspan="1" colspan="1">1.01 ± 0.69</td><td align="center" rowspan="1" colspan="1">0.90 ± 0.93</td><td align="center" rowspan="1" colspan="1">1.03 ± 0.73</td><td align="center" rowspan="1" colspan="1">1.02 ± 0.69</td></tr><tr><td align="left" rowspan="1" colspan="1"> Range</td><td align="center" rowspan="1" colspan="1">0.0, 6.63</td><td align="center" rowspan="1" colspan="1">0.06, 5.52</td><td align="center" rowspan="1" colspan="1">0.05, 6.59</td><td align="center" rowspan="1" colspan="1">0.25, 6.75</td><td align="center" rowspan="1" colspan="1">0.0, 6.2</td><td align="center" rowspan="1" colspan="1">0.06, 4.57</td></tr><tr><td align="left" rowspan="1" colspan="1">K1 mean ± SD</td><td align="center" rowspan="1" colspan="1">43.93 ± 1.67</td><td align="center" rowspan="1" colspan="1">43.57 ± 1.56</td><td align="center" rowspan="1" colspan="1">43.76 ± 1.53</td><td align="center" rowspan="1" colspan="1">43.48 ± 1.61</td><td align="center" rowspan="1" colspan="1">43.43 ± 1.49</td><td align="center" rowspan="1" colspan="1">43.54 ± 1.43</td></tr><tr><td align="left" rowspan="1" colspan="1">K2 mean ± SD</td><td align="center" rowspan="1" colspan="1">45.08 ± 1.73</td><td align="center" rowspan="1" colspan="1">44.64 ± 1.65</td><td align="center" rowspan="1" colspan="1">44.76 ± 1.56</td><td align="center" rowspan="1" colspan="1">44.08 ± 1.59</td><td align="center" rowspan="1" colspan="1">44.46 ± 1.56</td><td align="center" rowspan="1" colspan="1">44.56 ± 1.52</td></tr><tr><td align="left" rowspan="1" colspan="1">Corneal astigmatism (%)</td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td><td align="center" rowspan="1" colspan="1"> </td></tr><tr><td align="left" rowspan="1" colspan="1"> ≤0.5 D</td><td align="center" rowspan="1" colspan="1">20.76</td><td align="center" rowspan="1" colspan="1">21.2*</td><td align="center" rowspan="1" colspan="1">23.14</td><td align="center" rowspan="1" colspan="1">58.8</td><td align="center" rowspan="1" colspan="1">24.47</td><td align="center" rowspan="1" colspan="1">23.38</td></tr><tr><td align="left" rowspan="1" colspan="1"> ≥1.0 D</td><td align="center" rowspan="1" colspan="1">47.27</td><td align="center" rowspan="1" colspan="1">45.37</td><td align="center" rowspan="1" colspan="1">41.3</td><td align="center" rowspan="1" colspan="1">34.8</td><td align="center" rowspan="1" colspan="1">40.4</td><td align="center" rowspan="1" colspan="1">41.74</td></tr><tr><td align="left" rowspan="1" colspan="1"> ≥2.0 D</td><td align="center" rowspan="1" colspan="1">13.16</td><td align="center" rowspan="1" colspan="1">10.33</td><td align="center" rowspan="1" colspan="1">8.22</td><td align="center" rowspan="1" colspan="1">9.26**</td><td align="center" rowspan="1" colspan="1">9.67</td><td align="center" rowspan="1" colspan="1">8.32</td></tr><tr><td align="left" rowspan="1" colspan="1"> ≥3.0 D</td><td align="center" rowspan="1" colspan="1">3.75</td><td align="center" rowspan="1" colspan="1">2.22</td><td align="center" rowspan="1" colspan="1">3.52</td><td align="center" rowspan="1" colspan="1">5.61***</td><td align="center" rowspan="1" colspan="1">4.61</td><td align="center" rowspan="1" colspan="1">2.64</td></tr></tbody></table><table-wrap-foot><fn><p>*Not including 0.5 D, **not including 2.0 D, and ***not including 3.0 D.</p></fn><fn><p>D = diopter, K1 = flat keratometry, and K2 = steep keratometry.</p></fn></table-wrap-foot></table-wrap><table-wrap id="tab2" orientation="portrait" position="float"><label>Table 2</label><caption><p>Descriptive statistics by age group.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Age group (y)</th><th align="center" rowspan="1" colspan="1">Astigmatism (D)</th><th align="center" rowspan="1" colspan="1">K1 (D) mean ± SD</th><th align="center" rowspan="1" colspan="1">K2 (D) mean ± SD</th><th align="center" rowspan="1" colspan="1">Eyes (%)</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">30–40</td><td align="center" rowspan="1" colspan="1">1.33 ± 0.85</td><td align="center" rowspan="1" colspan="1">42.77 ± 2.23</td><td align="center" rowspan="1" colspan="1">44.10 ± 2.38</td><td align="center" rowspan="1" colspan="1">164 (1.32)</td></tr><tr><td align="left" rowspan="1" colspan="1">41–50</td><td align="center" rowspan="1" colspan="1">1.10 ± 1.10</td><td align="center" rowspan="1" colspan="1">43.51 ± 1.83</td><td align="center" rowspan="1" colspan="1">44.61 ± 1.92</td><td align="center" rowspan="1" colspan="1">571 (4.59)</td></tr><tr><td align="left" rowspan="1" colspan="1">51–60</td><td align="center" rowspan="1" colspan="1">0.99 ± 0.71</td><td align="center" rowspan="1" colspan="1">43.91 ± 1.61</td><td align="center" rowspan="1" colspan="1">44.90 ± 1.70</td><td align="center" rowspan="1" colspan="1">1869 (15.01)</td></tr><tr><td align="left" rowspan="1" colspan="1">61–70</td><td align="center" rowspan="1" colspan="1">1.05 ± 0.80</td><td align="center" rowspan="1" colspan="1">44.04 ± 1.63</td><td align="center" rowspan="1" colspan="1">45.10 ± 1.70</td><td align="center" rowspan="1" colspan="1">3226 (25.91)</td></tr><tr><td align="left" rowspan="1" colspan="1">71–80</td><td align="center" rowspan="1" colspan="1">1.20 ± 0.83</td><td align="center" rowspan="1" colspan="1">43.95 ± 1.65</td><td align="center" rowspan="1" colspan="1">45.14 ± 1.69</td><td align="center" rowspan="1" colspan="1">4517 (36.28)</td></tr><tr><td align="left" rowspan="1" colspan="1">81–90</td><td align="center" rowspan="1" colspan="1">1.34 ± 0.90</td><td align="center" rowspan="1" colspan="1">43.95 ± 1.68</td><td align="center" rowspan="1" colspan="1">45.28 ± 1.70</td><td align="center" rowspan="1" colspan="1">1993 (16.01)</td></tr><tr><td align="left" rowspan="1" colspan="1">≥91</td><td align="center" rowspan="1" colspan="1">1.39 ± 0.82</td><td align="center" rowspan="1" colspan="1">43.73 ± 1.65</td><td align="center" rowspan="1" colspan="1">45.12 ± 1.76</td><td align="center" rowspan="1" colspan="1">109 (0.88)</td></tr><tr><td align="left" rowspan="1" colspan="1"><italic>P</italic>*</td><td align="center" rowspan="1" colspan="1"><0.001</td><td align="center" rowspan="1" colspan="1"><0.001</td><td align="center" rowspan="1" colspan="1"><0.001</td><td align="center" rowspan="1" colspan="1"><0.001</td></tr></tbody></table><table-wrap-foot><fn><p>D = diopter, K1 = flat keratometry, and K2 = steep keratometry.</p></fn><fn><p>*Kruskal-Wallis test.</p></fn></table-wrap-foot></table-wrap></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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