https://m2.mtmt.hu/ hun 2026-06-11 22:18 true true 1 4 4 1 100 1 4 DESC publishedYear false ASC firstAuthor true ASC title true JournalArticle 32467836 VALIDATED true Cited By :6 Export Date: 10 July 2024 Correspondence Address: Langenbucher, A.; Department of Experimental Ophthalmology, Germany; email: achim.langenbucher@uks.eu Tradenames: IOLMaster, Carl Zeiss Microscopy, Germany Manufacturers: Carl Zeiss Microscopy, Germany 0 false 2026-05-21T08:10:06.853+0000 2023-04-10T12:02:15.702+0000 2021-10-26T09:22:52.515+0000 true 10062250 Molnár-Taga Márta /api/admin/10062250 Admin true 10062250 2024-07-10T12:04:52.957+0000 2023-04-10T12:02:15.956+0000 true 10062250 Molnár-Taga Márta /api/admin/10062250 Admin true 10062250 true false true 24 24 /api/publicationtype/24 PublicationType 1 true 24 JournalArticle true 10000059 Article true 24 24 /api/publicationtype/24 PublicationType 1 true 24 JournalArticle /api/subtype/10000059 Szakcikk SubType 101 true 10000059 true 1 /api/category/1 Category true 1 Langenbucher, A. Prediction of total corneal power from measured anterior corneal power on the IOLMaster 700 using a feedforward shallow neural network true true /api/journal/10009508 REVIEWED true false 10009508 false 10009508 true 1755-375X 1755-3768 Journal FOREIGN 100 5 e1080 e1087 e1080 2022 Background: The corneal back surface is known to add some astigmatism against-the-rule, which has to be considered in cataract surgery with toric lens implantation. The purpose of this study was to set up a deep learning algorithm which predicts the total corneal power from keratometry and biometric measures. Methods: Based on a large data set of measurements with the IOLMaster 700 from two clinical centres, data from N = 21 108 eyes were included, each record containing valid data for keratometry K, total keratometry TK, axial length AL, central corneal thickness CCT, anterior chamber depth ACD, lens thickness LT and horizontal corneal diameter W2W from an individual eye. After a vector decomposition of K and TK into equivalent power (.EQ) and projections of astigmatism to the 0°/90° (.AST0°) and 45°/135° (.AST45°) axis, a multi-output feedforward shallow neural network was derived to predict TK from K, AL, CCT, ACD, LT, W2W and patient age. Results: After some trial and error, the neural network having a Levenberg–Marquardt training function and three hidden layers (10/8/5 neurons) performed best and showed a fast convergence. The data set was split into training data (70%), validation data (15%) and test data (15%). The prediction error (predicted corneal power CPpred minus TK) of the network trained with the training and cross-validated with test data showed systematically narrower distributions for CPEQ-TKEQ, CPAST0°-TKAST0° and CPAST45°-TKAST45° compared with KEQ-TKEQ, KAST0°-TKAST0° and KAST45°-TKAST45°. There was no systematic offset in the components between CPpred and TK. Conclusion: Unlike any fixed correction term, which can compensate only for a static intercept of the astigmatic components TKEQ, TKAST0° and TKAST45° compared with KEQ, KAST0° and KAST45°, our trained neural network was able to reduce the variance in the prediction error significantly. This neural network could be used to account for the corneal back surface astigmatism for biometers where the corneal back surface measurement or total keratometry is not available. © 2021 The Authors. Acta Ophthalmologica published by John Wiley & Sons Ltd on behalf of Acta Ophthalmologica Scandinavica Foundation true true 2021 true true true false true false NONE 2026-05-21 false 12 0 12 4 7 11 12 11 12 12 12 4 4 4 8 0 12 4 12 4 0 1 1 Q1 false false false false 2022-01-24T10:24:50.404+0000 Szemészeti Klinika (SE / AOK / K) 2 5 1 6 0 true Language 10002 /api/language/10002 Angol English true 2 true PersonAuthorship 99195965 /api/authorship/99195965 1 0.167 true false true Author 10072292 /api/author/10072292 Langenbucher Achim true true Langenbucher A. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 99195966 /api/authorship/99195966 2 0.16666667 false false false Cayless A. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 99195967 /api/authorship/99195967 3 0.167 false false false Author 10000048 /api/author/10000048 Szentmáry Nóra true 10000048 true Szentmáry N. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 99195968 /api/authorship/99195968 4 0.16666667 false false false Weisensee J. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 99195969 /api/authorship/99195969 5 0.16666667 false false false Wendelstein J. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 99195970 /api/authorship/99195970 6 0.16666667 false true false Hoffmann P. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PublicationIdentifier 20123056 /api/publicationidentifier/20123056 PlainSource 6 /api/publicationsource/6 PublicationSourceType 10001 /api/publicationsourcetype/10001 true true true DOI DOI https://doi.org/@@@ true true 6 true IDENTICAL 10.1111/aos.15040 https://doi.org/10.1111/aos.15040 false true PublicationIdentifier 20129171 /api/publicationidentifier/20129171 PlainSource 1 /api/publicationsource/1 PublicationSourceType 10003 /api/publicationsourcetype/10003 false true true WoS WoS https://www.webofscience.com/wos/woscc/full-record/@@@ true true 1 true IDENTICAL 000708256100001 https://www.webofscience.com/wos/woscc/full-record/000708256100001 true true PublicationIdentifier 20123055 /api/publicationidentifier/20123055 PlainSource 3 /api/publicationsource/3 PublicationSourceType 10003 /api/publicationsourcetype/10003 false true true Scopus Scopus http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-@@@ true true 3 true IDENTICAL 85117229380 http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85117229380 false true PublicationIdentifier 20129166 /api/publicationidentifier/20129166 PlainSource 17 /api/publicationsource/17 PublicationSourceType 10003 /api/publicationsourcetype/10003 false true true PubMed PubMed http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=@@@&dopt=Abstract true true 17 true IDENTICAL 34664393 http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=34664393&dopt=Abstract true true Keyword 6369 /api/keyword/6369 true 6369 true Keyword 16626 /api/keyword/16626 true 16626 true Keyword 1427322 /api/keyword/1427322 true 1427322 true Keyword 1447582 /api/keyword/1447582 true 1447582 true Keyword 2529894 /api/keyword/2529894 true true Keyword 2529895 /api/keyword/2529895 true true SjrRating 11309375 /api/sjrrating/11309375 387 0.24 journal RatingType 10002 /api/ratingtype/10002 sjr true true ClassificationExternal 2701 /api/classificationexternal/2701 true 2701 true Q1 DIRECT true true /api/publication/32467836 <div class="JournalArticle Publication long-list"> <div class="authors"> <img title="Forrásközlemény" style="float: left" src="/frontend/resources/grid/publication-core-icon.png"> <img title="Idézőközlemény" style="float: left" src="/frontend/resources/grid/publication-citation-icon.png"> <div class="autype autype0"> <span class="author-name" mtid="10072292"><a href="/gui2/?type=authors&mode=browse&sel=10072292" target="_blank">Langenbucher A. ✉ (<span class="authorship-author-name">Langenbucher Achim</span> <span class="authorAux-mtmt"> Ophthalmology, ophthalmic optics</span>) </a> </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Cayless A. </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" mtid="10000048"><a href="/gui2/?type=authors&mode=browse&sel=10000048" target="_blank">Szentmáry N. (<span class="authorship-author-name">Szentmáry Nóra</span> <span class="authorAux-mtmt"> Szemészet</span>) </a> </span> <span class="author-affil"><span title="Semmelweis Egyetem">SE</span>/<span title="Általános Orvostudományi Kar">AOK</span>/<span title="Klinikum">K</span>/Szemészeti Klinika</span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Weisensee J. </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Wendelstein J. </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Hoffmann P. </span> </div> </div> <div class="title"><a href="/gui2/?mode=browse&params=publication;32467836" target="_blank">Prediction of total corneal power from measured anterior corneal power on the IOLMaster 700 using a feedforward shallow neural network</a></div> <div> <span class="journal-title">ACTA OPHTHALMOLOGICA</span> <span class="journal-issn">(<a target="_blank" href="https://portal.issn.org/resource/ISSN/1755-375X">1755-375X</a> <a target="_blank" href="https://portal.issn.org/resource/ISSN/1755-3768">1755-3768</a>)</span>: <span class="journal-volume">100</span> <span class="journal-issue">5</span> <span class="page"> pp e1080-e1087 </span> <span class="year">(2022)</span> </div> <div class="pub-footer"> <span class="language" xmlns="http://www.w3.org/1999/html">Nyelv: Angol | </span> <span class="identifiers"> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="10.1111/aos.15040" target="_blank" href="https://doi.org/10.1111/aos.15040"> DOI </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="000708256100001" target="_blank" href="https://www.webofscience.com/wos/woscc/full-record/000708256100001"> WoS </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="85117229380" target="_blank" href="http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85117229380"> Scopus </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="34664393" target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=34664393&dopt=Abstract"> PubMed </a> </span> </span> <OnlyViewableByAuthor><div class="ratings"> <div class="journal-subject">Folyóirat szakterülete: Scopus - Medicine (miscellaneous)&nbsp;&nbsp;&nbsp;SJR indikátor:&nbsp;Q1</div> <div class="journal-subject">Folyóirat szakterülete: Scopus - Ophthalmology&nbsp;&nbsp;&nbsp;SJR indikátor:&nbsp;Q1</div> </div></OnlyViewableByAuthor> <div class="publication-citation" style="margin-left: 0.5cm;"> <span title="Nyilvános idézőközlemények összesen, említések nélkül" class="citingPub-count">Nyilvános idéző összesen: 12</span> | Független: 4 | Függő: 8 | Nem jelölt: 0 | WoS jelölt: 11 | Scopus jelölt:&nbsp;12 | WoS/Scopus jelölt:&nbsp;12 | DOI jelölt:&nbsp;12 </div> <div class="publication-citation"> <a target="_blank" href="/api/publication?cond=citations.related;eq;32467836&sort=publishedYear,desc&sort=title"> Idézett közlemények száma: 1 </a> </div> <div class="mtid"><span class="long-pub-mtid">Közlemény: 32467836</span> | <span class="status-data status-VALIDATED"> Egyeztetett </span> Forrás Idéző | <span class="type-subtype">Folyóiratcikk ( Szakcikk ) </span> | <span class="pub-category">Tudományos</span> | <span class="publication-sourceOfData">Scopus</span> </div> <div class="lastModified">Utolsó módosítás: 2023.04.10. 14:02 Molnár-Taga Márta (SE 4-es admin) </div> <pre class="comment" style="margin-top: 0; margin-bottom: 0;"><u>Megjegyzés</u>: Cited By :6 Export Date: 10 July 2024 Correspondence Address: Langenbucher, A.; Department of Experimental Ophthalmology, Germany; email: achim.langenbucher@uks.eu Tradenames: IOLMaster, Carl Zeiss Microscopy, Germany Manufacturers: Carl Zeiss Microscopy, Germany</pre> </div></div> JournalArticle 32917249 VALIDATED true 0 false 2026-05-22T00:07:35.275+0000 2024-09-03T06:56:27.919+0000 2022-07-04T09:45:31.130+0000 true 10062250 Molnár-Taga Márta /api/admin/10062250 Admin true 10062250 2024-09-03T06:56:14.426+0000 2024-09-03T06:56:14.426+0000 2024-09-03T06:56:27.928+0000 true 10062250 Molnár-Taga Márta /api/admin/10062250 Admin true 10062250 true false true 24 24 /api/publicationtype/24 PublicationType 1 true 24 JournalArticle true 10000059 Article true 24 24 /api/publicationtype/24 PublicationType 1 true 24 JournalArticle /api/subtype/10000059 Szakcikk SubType 101 true 10000059 true 1 /api/category/1 Category true 1 Langenbucher, Achim Translation model for CW chord to angle Alpha derived from a Monte-Carlo simulation based on raytracing true true /api/journal/10007440 REVIEWED true false 10007440 false 10007440 true 1932-6203 Journal FOREIGN 17 5 e0267028 e0267028 13 2022 Background The Chang-Waring chord is provided by many ophthalmic instruments, but proper interpretation of this chord for use in centring refractive procedures at the cornea is not fully understood. The purpose of this study is to develop a strategy for translating the Chang-Waring chord (position of pupil centre relative to the Purkinje reflex PI) into angle Alpha using raytracing techniques. Methods The retrospective analysis was based on a large dataset of 8959 measurements of 8959 eyes from 1 clinical centre, using the Casia2 anterior segment tomographer. An optical model based on: corneal front and back surface radius Ra and Rp, asphericities Qa and Qp, corneal thickness CCT, anterior chamber depth ACD, and pupil centre position (X-Y position: PupX and PupY), was defined for each measurement. Using raytracing rays with an incident angle IX and IY the CW chord (CWX and CWY) was calculated. Using these data, a multivariable linear model was built up in terms of a Monte-Carlo simulation for a simple translation of incident ray angle to CW chord. Results Raytracing allows for calculation of the CW chord CWX/CWY from biometric measures and the incident ray angle IX/IY. In our dataset mean values of CWX = 0.32±0.30 mm and CWY = -0.10±0.26 mm were derived for a mean incident ray angle (angle Alpha) of IX = -5.02±1.77° and IY = 0.01±1.47°. The raytracing results could be modelled with a linear multivariable model, and the effect sizes for the prediction model for CWX are identified as Ra, Qa, Rp, CCT, ACD, PupX, PupY, IX, and for CWY they are Ra, Rp, PupY, and IY. Conclusion Today the CW chord can be directly measured with any biometer, topographer or tomographer. If biometric measures of Ra, Qa, Rp, CCT, ACD, PupX, PupY are available in addition to the CW chord components CWX and CWY, a prediction of angle Alpha is possible using a simple matrix operation. true 2022 true true true false true false GOLD 2026-05-22 true https://doi.org/10.1371/journal.pone.0267028 7 0 7 4 3 7 7 5 7 7 7 4 4 4 3 0 7 4 7 4 0 0 0 Q1 A false false false false 2022-07-03T09:54:59.689+0000 Szemészeti Klinika (SE / AOK / K) 2 5 1 6 0 true Language 10002 /api/language/10002 Angol English true 2 true PersonAuthorship 102268955 /api/authorship/102268955 1 0.167 true false true Author 10072292 /api/author/10072292 Langenbucher Achim true true Langenbucher Achim true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 102268956 /api/authorship/102268956 2 0.167 false false false Author 10000048 /api/author/10000048 Szentmáry Nóra true 10000048 true Szentmáry Nóra true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 102268957 /api/authorship/102268957 3 0.16666667 false false false Cayless Alan true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 102268958 /api/authorship/102268958 4 0.16666667 false false false Weisensee Johannes true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 102268959 /api/authorship/102268959 5 0.16666667 false false false Wendelstein Jascha true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 102268960 /api/authorship/102268960 6 0.16666667 false true false Hoffmann Peter true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PublicationIdentifier 21236930 /api/publicationidentifier/21236930 PlainSource 6 /api/publicationsource/6 PublicationSourceType 10001 /api/publicationsourcetype/10001 true true true DOI DOI https://doi.org/@@@ true true 6 true GOLD true IDENTICAL 10.1371/journal.pone.0267028 https://doi.org/10.1371/journal.pone.0267028 false true PublicationIdentifier 21606324 /api/publicationidentifier/21606324 PlainSource 1 /api/publicationsource/1 PublicationSourceType 10003 /api/publicationsourcetype/10003 false true true WoS WoS https://www.webofscience.com/wos/woscc/full-record/@@@ true true 1 true IDENTICAL 000835262300012 https://www.webofscience.com/wos/woscc/full-record/000835262300012 true true PublicationIdentifier 21606332 /api/publicationidentifier/21606332 PlainSource 3 /api/publicationsource/3 PublicationSourceType 10003 /api/publicationsourcetype/10003 false true true Scopus Scopus http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-@@@ true true 3 true IDENTICAL 85130010676 http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85130010676 true true PublicationIdentifier 21237268 /api/publicationidentifier/21237268 PlainSource 17 /api/publicationsource/17 PublicationSourceType 10003 /api/publicationsourcetype/10003 false true true PubMed PubMed http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=@@@&dopt=Abstract true true 17 true IDENTICAL 35576202 http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=35576202&dopt=Abstract false true Classification 12311 /api/classification/12311 true true MtaRating 10486385 /api/mtarating/10486385 RatingType 10023 /api/ratingtype/10023 PedTB Institute 14107 /api/institute/14107 0 false true false Pedagógiai Tudományos Bizottság Pedagógiai Tudományos Bizottság true 14107 true true true A true true MtaRating 519076 /api/mtarating/519076 RatingType 10007 /api/ratingtype/10007 SZTB Institute 14102 /api/institute/14102 0 false true false Szociológiai Tudományos Bizottság Committee on Sociology true 14102 true true true A nemzetközi true 19076 true MtaRating 11551131 /api/mtarating/11551131 RatingType 10010 /api/ratingtype/10010 RegTB Institute 14100 /api/institute/14100 0 false true false Regionális Tudományok Bizottsága Committee on Regional Studies true 14100 true true true B nemzetközi false true SjrRating 11272470 /api/sjrrating/11272470 17 0.24 journal RatingType 10002 /api/ratingtype/10002 sjr true true ClassificationExternal 1000 /api/classificationexternal/1000 true 1000 true Q1 DIRECT true true /api/publication/32917249 <div class="JournalArticle Publication long-list"> <div class="authors"> <img title="Forrásközlemény" style="float: left" src="/frontend/resources/grid/publication-core-icon.png"> <div class="autype autype0"> <span class="author-name" mtid="10072292"><a href="/gui2/?type=authors&mode=browse&sel=10072292" target="_blank">Langenbucher Achim ✉ (<span class="authorship-author-name">Langenbucher Achim</span> <span class="authorAux-mtmt"> Ophthalmology, ophthalmic optics</span>) </a> </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" mtid="10000048"><a href="/gui2/?type=authors&mode=browse&sel=10000048" target="_blank">Szentmáry Nóra (<span class="authorship-author-name">Szentmáry Nóra</span> <span class="authorAux-mtmt"> Szemészet</span>) </a> </span> <span class="author-affil"><span title="Semmelweis Egyetem">SE</span>/<span title="Általános Orvostudományi Kar">AOK</span>/<span title="Klinikum">K</span>/Szemészeti Klinika</span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Cayless Alan </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Weisensee Johannes </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Wendelstein Jascha </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Hoffmann Peter </span> </div> </div> <div class="title"><a href="/gui2/?mode=browse&params=publication;32917249" target="_blank">Translation model for CW chord to angle Alpha derived from a Monte-Carlo simulation based on raytracing</a></div> <div> <span class="journal-title">PLOS ONE</span> <span class="journal-issn">( <a target="_blank" href="https://portal.issn.org/resource/ISSN/1932-6203">1932-6203</a>)</span>: <span class="journal-volume">17</span> <span class="journal-issue">5</span> <span class="page"> Paper e0267028. 13 p. </span> <span class="year">(2022)</span> </div> <div class="pub-footer"> <span class="language" xmlns="http://www.w3.org/1999/html">Nyelv: Angol | </span> <span class="identifiers"> <span class="id identifier oa_GOLD" title=" Gold "> <a style="color:blue" title="10.1371/journal.pone.0267028" target="_blank" href="https://doi.org/10.1371/journal.pone.0267028"> DOI </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="000835262300012" target="_blank" href="https://www.webofscience.com/wos/woscc/full-record/000835262300012"> WoS </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="85130010676" target="_blank" href="http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85130010676"> Scopus </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="35576202" target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=35576202&dopt=Abstract"> PubMed </a> </span> </span> <OnlyViewableByAuthor><div class="ratings"> <div class="journal-subject">Folyóirat szakterülete: Scopus - Multidisciplinary&nbsp;&nbsp;&nbsp;SJR indikátor:&nbsp;Q1</div> <div class="journal-subject">Pedagógiai Tudományos Bizottság II. FTO PedTB [1901-]&nbsp;&nbsp;&nbsp;A</div> <div class="journal-subject">Szociológiai Tudományos Bizottság IXGJO SZTB [1901-]&nbsp;&nbsp;&nbsp;A nemzetközi</div> <div class="journal-subject">Regionális Tudományok Bizottsága IXGJO RTB [1901-]&nbsp;&nbsp;&nbsp;B nemzetközi</div> </div></OnlyViewableByAuthor> <div class="publication-citation" style="margin-left: 0.5cm;"> <span title="Nyilvános idézőközlemények összesen, említések nélkül" class="citingPub-count">Nyilvános idéző összesen: 7</span> | Független: 4 | Függő: 3 | Nem jelölt: 0 | WoS jelölt: 5 | Scopus jelölt:&nbsp;7 | WoS/Scopus jelölt:&nbsp;7 | DOI jelölt:&nbsp;7 </div> <div class="mtid"><span class="long-pub-mtid">Közlemény: 32917249</span> | <span class="status-data status-VALIDATED"> Egyeztetett </span> Forrás | <span class="type-subtype">Folyóiratcikk ( Szakcikk ) </span> | <span class="pub-category">Tudományos</span> | <span class="publication-sourceOfData">RIS-Egyéb</span> </div> <div class="lastModified">Utolsó módosítás: 2024.09.03. 08:56 Molnár-Taga Márta (SE 4-es admin) </div> </div></div> JournalArticle 31900248 ADMIN_APPROVED true 0 false 2026-05-20T15:59:34.879+0000 2022-01-16T17:24:24.843+0000 2021-03-04T10:52:37.603+0000 true 10062250 Molnár-Taga Márta /api/admin/10062250 Admin true 10062250 2025-10-03T09:37:33.236+0000 2022-01-16T17:24:24.855+0000 true 10065569 Pécsi Éva /api/admin/10065569 Admin true Admin 10003133 /api/admin/10003133 Boros Annamária true 10003133 true 2021-05-28T07:17:04.557+0000 true false true 24 24 /api/publicationtype/24 PublicationType 1 true 24 JournalArticle true 10000059 Article true 24 24 /api/publicationtype/24 PublicationType 1 true 24 JournalArticle /api/subtype/10000059 Szakcikk SubType 101 true 10000059 true 1 /api/category/1 Category true 1 Langenbucher, A. Back-calculation of keratometer index based on OCT data and raytracing – a Monte Carlo simulation true true /api/journal/10009508 REVIEWED true false 10009508 false 10009508 true 1755-375X 1755-3768 Journal FOREIGN 99 8 843 849 843 7 2021 Purpose: This study aims to develop a raytracing-based strategy for calculating corneal power from anterior segment optical coherence tomography data and extracting the individual keratometer index, which converts the corneal front surface radius to corneal power. Methods: A large OCT dataset (10,218 eyes of 8,430 patients) from the Casia 2 (Tomey, Japan) was post-processed in MATLAB (MathWorks, USA). Radius of curvature, asphericity of the corneal front and back surface, central corneal thickness and pupil size (aperture) were used to trace a bundle of rays through the cornea and derive the best focus plane. Corneal power was calculated with respect to the corneal front vertex plane, and the keratometer index was back-calculated using corneal power and front surface radius. Keratometer index was analysed in a multivariate linear model. Results: The averaged resulting keratometer index was 1.3317 ± 0.0017 with a median of 1.3317 and range from 1.3233 to 1.3390. In a univariate model, only the front surface asphericity affected the keratometer index. The multivariate model for modelling the keratometer index using all 6 input parameters performed very well (RMS error: 5.54e-4, R2: 0.90, significance vs. constant model: <0.0001). Conclusions: In the classical calculation, the keratometer index used for converting corneal radius to dioptric power uses several model assumptions. As these assumptions are not generally satisfied, corneal power cannot be calculated from corneal front surface radius alone. Considering all 6 input variables, the linear prediction model performs well and can be used if all input parameters are measured with a tomographer. © 2021 The Authors. 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