Comparison of 2 A-scans : Measuring ocular parameters
Identifieur interne : 007034 ( Main/Curation ); précédent : 007033; suivant : 007035Comparison of 2 A-scans : Measuring ocular parameters
Auteurs : Sverker Norrby [Pays-Bas] ; Eva Lydahl [Suède] ; Gabor Koranyi [Suède] ; Mikaela Taube [Suède]Source :
- Journal of cataract and refractive surgery [ 0886-3350 ] ; 2003.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Homme.
English descriptors
- KwdEn :
- Anterior Chamber (ultrasonography), Cataract, Cataract (ultrasonography), Cataract Extraction, Comparative study, Dioptric power, Echography, Eye (ultrasonography), Human, Humans, Intraocular lens, Length, Lens, Crystalline (ultrasonography), Lenses, Intraocular, Measurement method, Ocular axis, Posterior chamber, Postoperative Period, Predictive Value of Tests, Treatment, Ultrasonography (instrumentation).
- MESH :
- instrumentation : Ultrasonography.
- ultrasonography : Anterior Chamber, Cataract, Eye, Lens, Crystalline.
- Cataract Extraction, Humans, Lenses, Intraocular, Postoperative Period, Predictive Value of Tests.
Abstract
Purpose: To compare 2 A-scan instruments with regard to differences in measured results for the same patient sample. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: In a study to evaluate the lens-haptic plane concept of intraocular lens (IOL) power calculation, 148 patients eligible for cataract surgery were measured with 2 different A-scan instruments (BVI Axis and Sonomed 1500). The axial length (AL), anterior chamber depth (ACD), and lens thickness (LT) results were analyzed for systematic differences and random errors. Results: The Sonomed 1500 measured systematically longer than the BVI Axis for AL (0.41 mm) and ACD (0.28 mm), although the correlation was good (r = 0.99 and r = 0.87, respectively). The LT correlated poorly (r = 0.18) and showed no systematic trend. The relative random errors (standard deviations) in ACD (7.2%) and LT (18.6%) were larger than that of the AL (0.8%). The systematic difference in the AL corresponds to a 1.0 diopter difference in the A-constant. Conclusions: The large random errors in the ACD and LT reduce their value as predictors of postoperative IOL position in formulas that use them. Systematic differences in AL can be large enough to require separate formula constants for different pieces of equipment. If this is the situation in 1 setting, there is a risk of mistakes. This confusion could be avoided if there were an agreed standard and a universal calibration procedure for instruments intended for AL measurement.
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Pascal:03-0155643Le document en format XML
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aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author><author><name sortKey="Koranyi, Gabor" sort="Koranyi, Gabor" uniqKey="Koranyi G" first="Gabor" last="Koranyi">Gabor Koranyi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>St. Erik's Eye Hospital</s1><s2>Stockholm</s2><s3>SWE</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author><author><name sortKey="Taube, Mikaela" sort="Taube, Mikaela" uniqKey="Taube M" first="Mikaela" last="Taube">Mikaela Taube</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>St. Erik's Eye Hospital</s1><s2>Stockholm</s2><s3>SWE</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of cataract and refractive surgery</title><title level="j" type="abbreviated">J. cataract refractive surg.</title><idno type="ISSN">0886-3350</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of cataract and refractive surgery</title><title level="j" type="abbreviated">J. cataract refractive surg.</title><idno type="ISSN">0886-3350</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Anterior Chamber (ultrasonography)</term><term>Cataract</term><term>Cataract (ultrasonography)</term><term>Cataract Extraction</term><term>Comparative study</term><term>Dioptric power</term><term>Echography</term><term>Eye (ultrasonography)</term><term>Human</term><term>Humans</term><term>Intraocular lens</term><term>Length</term><term>Lens, Crystalline (ultrasonography)</term><term>Lenses, Intraocular</term><term>Measurement method</term><term>Ocular axis</term><term>Posterior chamber</term><term>Postoperative Period</term><term>Predictive Value of Tests</term><term>Treatment</term><term>Ultrasonography (instrumentation)</term></keywords><keywords scheme="MESH" qualifier="instrumentation" xml:lang="en"><term>Ultrasonography</term></keywords><keywords scheme="MESH" qualifier="ultrasonography" xml:lang="en"><term>Anterior Chamber</term><term>Cataract</term><term>Eye</term><term>Lens, Crystalline</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Cataract Extraction</term><term>Humans</term><term>Lenses, Intraocular</term><term>Postoperative Period</term><term>Predictive Value of Tests</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etude comparative</term><term>Homme</term><term>Méthode mesure</term><term>Lentille intraoculaire</term><term>Puissance dioptrique</term><term>Cataracte</term><term>Traitement</term><term>Chambre postérieure</term><term>Echographie</term><term>Longueur</term><term>Axe oculaire</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Homme</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Purpose: To compare 2 A-scan instruments with regard to differences in measured results for the same patient sample. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: In a study to evaluate the lens-haptic plane concept of intraocular lens (IOL) power calculation, 148 patients eligible for cataract surgery were measured with 2 different A-scan instruments (BVI Axis and Sonomed 1500). The axial length (AL), anterior chamber depth (ACD), and lens thickness (LT) results were analyzed for systematic differences and random errors. Results: The Sonomed 1500 measured systematically longer than the BVI Axis for AL (0.41 mm) and ACD (0.28 mm), although the correlation was good (r = 0.99 and r = 0.87, respectively). The LT correlated poorly (r = 0.18) and showed no systematic trend. The relative random errors (standard deviations) in ACD (7.2%) and LT (18.6%) were larger than that of the AL (0.8%). The systematic difference in the AL corresponds to a 1.0 diopter difference in the A-constant. Conclusions: The large random errors in the ACD and LT reduce their value as predictors of postoperative IOL position in formulas that use them. Systematic differences in AL can be large enough to require separate formula constants for different pieces of equipment. If this is the situation in 1 setting, there is a risk of mistakes. This confusion could be avoided if there were an agreed standard and a universal calibration procedure for instruments intended for AL measurement.</div></front></TEI><double idat="0886-3350:2003:Norrby S:comparison:of:a"><INIST><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Comparison of 2 A-scans : Measuring ocular parameters</title><author><name sortKey="Norrby, Sverker" sort="Norrby, Sverker" uniqKey="Norrby S" first="Sverker" last="Norrby">Sverker Norrby</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Pharmacia</s1><s2>Groningen</s2><s3>NLD</s3><sZ>1 aut.</sZ></inist:fA14><country>Pays-Bas</country><placeName><settlement type="city">Groningue</settlement><region nuts="2" type="province">Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Lydahl, Eva" sort="Lydahl, Eva" uniqKey="Lydahl E" first="Eva" last="Lydahl">Eva Lydahl</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>St. Erik's Eye Hospital</s1><s2>Stockholm</s2><s3>SWE</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author><author><name sortKey="Koranyi, Gabor" sort="Koranyi, Gabor" uniqKey="Koranyi G" first="Gabor" last="Koranyi">Gabor Koranyi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>St. Erik's Eye Hospital</s1><s2>Stockholm</s2><s3>SWE</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author><author><name sortKey="Taube, Mikaela" sort="Taube, Mikaela" uniqKey="Taube M" first="Mikaela" last="Taube">Mikaela Taube</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>St. Erik's Eye Hospital</s1><s2>Stockholm</s2><s3>SWE</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">03-0155643</idno><date when="2003">2003</date><idno type="stanalyst">PASCAL 03-0155643 INIST</idno><idno type="RBID">Pascal:03-0155643</idno><idno type="wicri:Area/PascalFrancis/Corpus">001195</idno><idno type="wicri:Area/PascalFrancis/Curation">000316</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000E85</idno><idno type="wicri:doubleKey">0886-3350:2003:Norrby S:comparison:of:a</idno><idno type="wicri:Area/Main/Merge">007517</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Comparison of 2 A-scans : Measuring ocular parameters</title><author><name sortKey="Norrby, Sverker" sort="Norrby, Sverker" uniqKey="Norrby S" first="Sverker" last="Norrby">Sverker Norrby</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Pharmacia</s1><s2>Groningen</s2><s3>NLD</s3><sZ>1 aut.</sZ></inist:fA14><country>Pays-Bas</country><placeName><settlement type="city">Groningue</settlement><region nuts="2" type="province">Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Lydahl, Eva" sort="Lydahl, Eva" uniqKey="Lydahl E" first="Eva" last="Lydahl">Eva Lydahl</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>St. Erik's Eye Hospital</s1><s2>Stockholm</s2><s3>SWE</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author><author><name sortKey="Koranyi, Gabor" sort="Koranyi, Gabor" uniqKey="Koranyi G" first="Gabor" last="Koranyi">Gabor Koranyi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>St. Erik's Eye Hospital</s1><s2>Stockholm</s2><s3>SWE</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author><author><name sortKey="Taube, Mikaela" sort="Taube, Mikaela" uniqKey="Taube M" first="Mikaela" last="Taube">Mikaela Taube</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>St. Erik's Eye Hospital</s1><s2>Stockholm</s2><s3>SWE</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Suède</country><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of cataract and refractive surgery</title><title level="j" type="abbreviated">J. cataract refractive surg.</title><idno type="ISSN">0886-3350</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of cataract and refractive surgery</title><title level="j" type="abbreviated">J. cataract refractive surg.</title><idno type="ISSN">0886-3350</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cataract</term><term>Comparative study</term><term>Dioptric power</term><term>Echography</term><term>Human</term><term>Intraocular lens</term><term>Length</term><term>Measurement method</term><term>Ocular axis</term><term>Posterior chamber</term><term>Treatment</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etude comparative</term><term>Homme</term><term>Méthode mesure</term><term>Lentille intraoculaire</term><term>Puissance dioptrique</term><term>Cataracte</term><term>Traitement</term><term>Chambre postérieure</term><term>Echographie</term><term>Longueur</term><term>Axe oculaire</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Homme</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Purpose: To compare 2 A-scan instruments with regard to differences in measured results for the same patient sample. Setting: St. Erik's Eye Hospital, Stockholm, Sweden. Methods: In a study to evaluate the lens-haptic plane concept of intraocular lens (IOL) power calculation, 148 patients eligible for cataract surgery were measured with 2 different A-scan instruments (BVI Axis and Sonomed 1500). The axial length (AL), anterior chamber depth (ACD), and lens thickness (LT) results were analyzed for systematic differences and random errors. Results: The Sonomed 1500 measured systematically longer than the BVI Axis for AL (0.41 mm) and ACD (0.28 mm), although the correlation was good (r = 0.99 and r = 0.87, respectively). The LT correlated poorly (r = 0.18) and showed no systematic trend. The relative random errors (standard deviations) in ACD (7.2%) and LT (18.6%) were larger than that of the AL (0.8%). The systematic difference in the AL corresponds to a 1.0 diopter difference in the A-constant. Conclusions: The large random errors in the ACD and LT reduce their value as predictors of postoperative IOL position in formulas that use them. Systematic differences in AL can be large enough to require separate formula constants for different pieces of equipment. If this is the situation in 1 setting, there is a risk of mistakes. This confusion could be avoided if there were an agreed standard and a universal calibration procedure for instruments intended for AL measurement.</div></front></TEI></INIST><PubMed><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Comparison of 2 A-scans.</title><author><name sortKey="Norrby, Sverker" sort="Norrby, Sverker" uniqKey="Norrby S" first="Sverker" last="Norrby">Sverker Norrby</name><affiliation wicri:level="3"><nlm:affiliation>Pharmacia, Groningen, The Netherlands.</nlm:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Pharmacia, Groningen</wicri:regionArea><placeName><settlement type="city">Groningue</settlement><region nuts="2" type="province">Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Lydahl, Eva" sort="Lydahl, Eva" uniqKey="Lydahl E" first="Eva" last="Lydahl">Eva Lydahl</name></author><author><name sortKey="Koranyi, Gabor" sort="Koranyi, Gabor" uniqKey="Koranyi G" first="Gabor" last="Koranyi">Gabor Koranyi</name></author><author><name sortKey="Taube, Mikaela" sort="Taube, Mikaela" uniqKey="Taube M" first="Mikaela" last="Taube">Mikaela Taube</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2003">2003</date><idno type="RBID">pubmed:12551674</idno><idno type="pmid">12551674</idno><idno type="wicri:Area/PubMed/Corpus">001C32</idno><idno type="wicri:Area/PubMed/Curation">001C32</idno><idno type="wicri:Area/PubMed/Checkpoint">001944</idno><idno type="wicri:Area/Ncbi/Merge">000354</idno><idno type="wicri:Area/Ncbi/Curation">000354</idno><idno type="wicri:Area/Ncbi/Checkpoint">000354</idno><idno type="wicri:doubleKey">0886-3350:2003:Norrby S:comparison:of:a</idno><idno type="wicri:Area/Main/Merge">007214</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Comparison of 2 A-scans.</title><author><name sortKey="Norrby, Sverker" sort="Norrby, Sverker" uniqKey="Norrby S" first="Sverker" last="Norrby">Sverker Norrby</name><affiliation wicri:level="3"><nlm:affiliation>Pharmacia, Groningen, The Netherlands.</nlm:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Pharmacia, Groningen</wicri:regionArea><placeName><settlement type="city">Groningue</settlement><region nuts="2" type="province">Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Lydahl, Eva" sort="Lydahl, Eva" uniqKey="Lydahl E" first="Eva" last="Lydahl">Eva Lydahl</name></author><author><name sortKey="Koranyi, Gabor" sort="Koranyi, Gabor" uniqKey="Koranyi G" first="Gabor" last="Koranyi">Gabor Koranyi</name></author><author><name sortKey="Taube, Mikaela" sort="Taube, Mikaela" uniqKey="Taube M" first="Mikaela" last="Taube">Mikaela Taube</name></author></analytic><series><title level="j">Journal of cataract and refractive surgery</title><idno type="ISSN">0886-3350</idno><imprint><date when="2003" type="published">2003</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Anterior Chamber (ultrasonography)</term><term>Cataract (ultrasonography)</term><term>Cataract Extraction</term><term>Eye (ultrasonography)</term><term>Humans</term><term>Lens, Crystalline (ultrasonography)</term><term>Lenses, Intraocular</term><term>Postoperative Period</term><term>Predictive Value of Tests</term><term>Ultrasonography (instrumentation)</term></keywords><keywords scheme="MESH" qualifier="instrumentation" xml:lang="en"><term>Ultrasonography</term></keywords><keywords scheme="MESH" qualifier="ultrasonography" xml:lang="en"><term>Anterior Chamber</term><term>Cataract</term><term>Eye</term><term>Lens, Crystalline</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Cataract Extraction</term><term>Humans</term><term>Lenses, Intraocular</term><term>Postoperative Period</term><term>Predictive Value of Tests</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">To compare 2 A-scan instruments with regard to differences in measured results for the same patient sample.</div></front></TEI></PubMed></double></record>Pour manipuler ce document sous Unix (Dilib)
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