Prediction of intraocular lens power using the lens haptic plane concept
Identifieur interne : 008A32 ( Main/Curation ); précédent : 008A31; suivant : 008A33Prediction of intraocular lens power using the lens haptic plane concept
Auteurs : N. E. Sverker Norrby [Pays-Bas] ; Gabor Koranyi [Suède]Source :
- Journal of Cataract & Refractive Surgery [ 0886-3350 ] ; 1997.
English descriptors
- KwdEn :
- MESH :
- anatomy & histology : Anterior Chamber, Lens, Crystalline.
- Aged, Aged, 80 and over, Algorithms, Biometry, Female, Follow-Up Studies, Humans, Lenses, Intraocular, Male, Middle Aged, Optics and Photonics, Pilot Projects, Refraction, Ocular.
Abstract
Purpose: To test algorithms for the preoperative estimation of the lens haptic plane (LHP) and to assess these in terms of predictability of postoperative refraction.Setting: SA Erik's Eye Hospital, Stockholm, Sweden.Methods: Preoperative axial length, anterior chamber depth (ACID), and cataractous lens thickness were measured in consecutive cases scheduled for phacoemulsification and posterior chamber intraocular lens (IOL) implantation. The algorithms tested used ACID and cataractous lens thickness to estimate LHP. The exact geometry of the IOL was used to calculate postoperative ACID from LHP. Thick lens theory and paraxial ray tracing were used to calculate predicted postoperative refraction. The calculated value was compared with actual refraction 3 to 6 months postoperatively.Results: Mean absolute average error in predicted refraction was 0.38 diopters (D), with 78% of eyes within 0.50 D and 97% within 1.00 D for the best algorithm.Conclusions: The predictability in postoperative refraction found by applying the LHP concept and paraxial ray tracing was excellent. However, the small sample, with its unusually slight variation in axial lengths, did not allow statistically significant differences between different postoperative refraction prediction methods to be demonstrated.
Url:
DOI: 10.1016/S0886-3350(97)80350-1
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Sverker Norrby</name></author><author><name sortKey="Koranyi, Gabor" sort="Koranyi, Gabor" uniqKey="Koranyi G" first="Gabor" last="Koranyi">Gabor Koranyi</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:71C15A030A556ED1C7CB95F92B0407DCD0079DB4</idno><date when="1997" year="1997">1997</date><idno type="doi">10.1016/S0886-3350(97)80350-1</idno><idno type="url">https://api.istex.fr/document/71C15A030A556ED1C7CB95F92B0407DCD0079DB4/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000397</idno><idno type="wicri:Area/Istex/Curation">000397</idno><idno type="wicri:Area/Istex/Checkpoint">003B60</idno><idno type="wicri:doubleKey">0886-3350:1997:Norrby N:prediction:of:intraocular</idno><idno type="wicri:Area/Main/Merge">009311</idno><idno type="wicri:source">PubMed</idno><idno type="RBID">pubmed:9113578</idno><idno type="wicri:Area/PubMed/Corpus">002025</idno><idno type="wicri:Area/PubMed/Curation">002025</idno><idno type="wicri:Area/PubMed/Checkpoint">001D45</idno><idno type="wicri:Area/Ncbi/Merge">004636</idno><idno type="wicri:Area/Ncbi/Curation">004636</idno><idno type="wicri:Area/Ncbi/Checkpoint">004636</idno><idno type="wicri:doubleKey">0886-3350:1997:Norrby N:prediction:of:intraocular</idno><idno type="wicri:Area/Main/Merge">009127</idno><idno type="wicri:Area/Main/Curation">008A32</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Prediction of intraocular lens power using the lens haptic plane concept</title><author><name sortKey="Norrby, N E Sverker" sort="Norrby, N E Sverker" uniqKey="Norrby N" first="N. 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The algorithms tested used ACID and cataractous lens thickness to estimate LHP. The exact geometry of the IOL was used to calculate postoperative ACID from LHP. Thick lens theory and paraxial ray tracing were used to calculate predicted postoperative refraction. The calculated value was compared with actual refraction 3 to 6 months postoperatively.Results: Mean absolute average error in predicted refraction was 0.38 diopters (D), with 78% of eyes within 0.50 D and 97% within 1.00 D for the best algorithm.Conclusions: The predictability in postoperative refraction found by applying the LHP concept and paraxial ray tracing was excellent. However, the small sample, with its unusually slight variation in axial lengths, did not allow statistically significant differences between different postoperative refraction prediction methods to be demonstrated.</div></front></TEI><double idat="0886-3350:1997:Norrby N:prediction:of:intraocular"><ISTEX><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Prediction of intraocular lens power using the lens haptic plane concept</title><author><name sortKey="Norrby, N E Sverker" sort="Norrby, N E Sverker" uniqKey="Norrby N" first="N. E. Sverker" last="Norrby">N. E. Sverker Norrby</name></author><author><name sortKey="Koranyi, Gabor" sort="Koranyi, Gabor" uniqKey="Koranyi G" first="Gabor" last="Koranyi">Gabor Koranyi</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:71C15A030A556ED1C7CB95F92B0407DCD0079DB4</idno><date when="1997" year="1997">1997</date><idno type="doi">10.1016/S0886-3350(97)80350-1</idno><idno type="url">https://api.istex.fr/document/71C15A030A556ED1C7CB95F92B0407DCD0079DB4/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000397</idno><idno type="wicri:Area/Istex/Curation">000397</idno><idno type="wicri:Area/Istex/Checkpoint">003B60</idno><idno type="wicri:doubleKey">0886-3350:1997:Norrby N:prediction:of:intraocular</idno><idno type="wicri:Area/Main/Merge">009311</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Prediction of intraocular lens power using the lens haptic plane concept</title><author><name sortKey="Norrby, N E Sverker" sort="Norrby, N E Sverker" uniqKey="Norrby N" first="N. E. Sverker" last="Norrby">N. E. Sverker Norrby</name><affiliation wicri:level="3"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>From Pharmacia Production BV, Groningen</wicri:regionArea><placeName><settlement type="city">Groningue</settlement><region nuts="2" type="province">Groningue (province)</region></placeName></affiliation><affiliation wicri:level="3"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Reprint requests to NE Sverker Norrby, PhD, Pharmacia & Upjohn, van Swietenlaan 5, NL-9728NX, Groningen</wicri:regionArea><placeName><settlement type="city">Groningue</settlement><region nuts="2" type="province">Groningue (province)</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"><country xml:lang="fr">Suède</country><wicri:regionArea>Karolinska Institute, St Eriks Eye Hospital, Stockholm</wicri:regionArea><placeName><settlement type="city">Stockholm</settlement><region nuts="2">Svealand</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Cataract & Refractive Surgery</title><title level="j" type="abbrev">JCRS</title><idno type="ISSN">0886-3350</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997">1997</date><biblScope unit="volume">23</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="254">254</biblScope><biblScope unit="page" to="259">259</biblScope></imprint><idno type="ISSN">0886-3350</idno></series><idno type="istex">71C15A030A556ED1C7CB95F92B0407DCD0079DB4</idno><idno type="DOI">10.1016/S0886-3350(97)80350-1</idno><idno type="PII">S0886-3350(97)80350-1</idno><idno type="ArticleID">80350</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0886-3350</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Purpose: To test algorithms for the preoperative estimation of the lens haptic plane (LHP) and to assess these in terms of predictability of postoperative refraction.Setting: SA Erik's Eye Hospital, Stockholm, Sweden.Methods: Preoperative axial length, anterior chamber depth (ACID), and cataractous lens thickness were measured in consecutive cases scheduled for phacoemulsification and posterior chamber intraocular lens (IOL) implantation. The algorithms tested used ACID and cataractous lens thickness to estimate LHP. The exact geometry of the IOL was used to calculate postoperative ACID from LHP. Thick lens theory and paraxial ray tracing were used to calculate predicted postoperative refraction. The calculated value was compared with actual refraction 3 to 6 months postoperatively.Results: Mean absolute average error in predicted refraction was 0.38 diopters (D), with 78% of eyes within 0.50 D and 97% within 1.00 D for the best algorithm.Conclusions: The predictability in postoperative refraction found by applying the LHP concept and paraxial ray tracing was excellent. However, the small sample, with its unusually slight variation in axial lengths, did not allow statistically significant differences between different postoperative refraction prediction methods to be demonstrated.</div></front></TEI></ISTEX><PubMed><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Prediction of intraocular lens power using the lens haptic plane concept.</title><author><name sortKey="Norrby, N E" sort="Norrby, N E" uniqKey="Norrby N" first="N E" last="Norrby">N E Norrby</name><affiliation wicri:level="3"><nlm:affiliation>Pharmacia Production BV, Groningen, The Netherlands.</nlm:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Pharmacia Production BV, Groningen</wicri:regionArea><placeName><settlement type="city">Groningue</settlement><region nuts="2" type="province">Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Koranyi, G" sort="Koranyi, G" uniqKey="Koranyi G" first="G" last="Koranyi">G. Koranyi</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="1997">1997</date><idno type="RBID">pubmed:9113578</idno><idno type="pmid">9113578</idno><idno type="wicri:Area/PubMed/Corpus">002025</idno><idno type="wicri:Area/PubMed/Curation">002025</idno><idno type="wicri:Area/PubMed/Checkpoint">001D45</idno><idno type="wicri:Area/Ncbi/Merge">004636</idno><idno type="wicri:Area/Ncbi/Curation">004636</idno><idno type="wicri:Area/Ncbi/Checkpoint">004636</idno><idno type="wicri:doubleKey">0886-3350:1997:Norrby N:prediction:of:intraocular</idno><idno type="wicri:Area/Main/Merge">009127</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Prediction of intraocular lens power using the lens haptic plane concept.</title><author><name sortKey="Norrby, N E" sort="Norrby, N E" uniqKey="Norrby N" first="N E" last="Norrby">N E Norrby</name><affiliation wicri:level="3"><nlm:affiliation>Pharmacia Production BV, Groningen, The Netherlands.</nlm:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Pharmacia Production BV, Groningen</wicri:regionArea><placeName><settlement type="city">Groningue</settlement><region nuts="2" type="province">Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Koranyi, G" sort="Koranyi, G" uniqKey="Koranyi G" first="G" last="Koranyi">G. Koranyi</name></author></analytic><series><title level="j">Journal of cataract and refractive surgery</title><idno type="ISSN">0886-3350</idno><imprint><date when="1997" type="published">1997</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aged</term><term>Aged, 80 and over</term><term>Algorithms</term><term>Anterior Chamber (anatomy & histology)</term><term>Biometry</term><term>Female</term><term>Follow-Up Studies</term><term>Humans</term><term>Lens, Crystalline (anatomy & histology)</term><term>Lenses, Intraocular</term><term>Male</term><term>Middle Aged</term><term>Optics and Photonics</term><term>Pilot Projects</term><term>Refraction, Ocular</term></keywords><keywords scheme="MESH" qualifier="anatomy & histology" xml:lang="en"><term>Anterior Chamber</term><term>Lens, Crystalline</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Aged</term><term>Aged, 80 and over</term><term>Algorithms</term><term>Biometry</term><term>Female</term><term>Follow-Up Studies</term><term>Humans</term><term>Lenses, Intraocular</term><term>Male</term><term>Middle Aged</term><term>Optics and Photonics</term><term>Pilot Projects</term><term>Refraction, Ocular</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">To test algorithms for the preoperative estimation of the lens haptic plane (LHP) and to assess these in terms of predictability of postoperative refraction.</div></front></TEI></PubMed></double></record>Pour manipuler ce document sous Unix (Dilib)
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