https://m2.mtmt.hu/ hun 2026-06-24 12:53 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. 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 2026-05-20 false 14 0 14 3 6 13 14 11 14 14 14 3 3 3 11 0 14 3 14 3 0 5 5 Folyóiratcikk Journal Article 24 13 Könyvrészlet Chapter in Book 25 1 Könyv Book 23 0 Egyéb konferenciaközlemény Conference paper 31 0 Egyéb konferenciakötet Conference proceedings 32 0 Oltalmi formák Protection forms 26 0 Disszertáció Thesis 28 0 Egyéb Miscellaneous 29 0 Alkotás Achievement 22 0 Kutatási adat Research data 33 0 Folyóiratcikk Journal Article 24 0 0 0 Könyvrészlet Chapter in Book 25 0 0 0 Könyv Book 23 0 0 0 Egyéb konferenciaközlemény Conference paper 31 0 0 0 Egyéb konferenciakötet Conference proceedings 32 0 0 0 Oltalmi formák Protection forms 26 0 0 0 Disszertáció Thesis 28 0 0 0 Egyéb Miscellaneous 29 0 0 0 Alkotás Achievement 22 0 0 0 Kutatási adat Research data 33 0 0 0 2021 0 2 1 2 1 2022 0 0 0 0 0 2023 0 2 1 2 1 2024 0 3 0 3 0 2025 0 5 1 5 1 2026 0 2 0 2 0 Q1 false false false false 2021-06-02T09:56:03.060+0000 Szemészeti Klinika (SE / AOK / K) 2 5 1 6 0 true 10003133 Language 10002 /api/language/10002 Angol English true 2 true PersonAuthorship 95621271 /api/authorship/95621271 1 0.16666667 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 95621272 /api/authorship/95621272 2 0.16666667 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 95621273 /api/authorship/95621273 3 0.16666667 false false false Weisensee J. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 95621274 /api/authorship/95621274 4 0.16666667 false false false Cayless A. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 95621275 /api/authorship/95621275 5 0.16666667 false false false Menapace R. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 95621276 /api/authorship/95621276 6 0.16666667 false true false Hoffmann P. true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PublicationIdentifier 18498204 /api/publicationidentifier/18498204 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.14794 https://doi.org/10.1111/aos.14794 false true PublicationIdentifier 18498205 /api/publicationidentifier/18498205 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 000617103000001 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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" >Cayless A. </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Menapace R. </span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" >Hoffmann P. </span> </div> </div> <div class="title"><a href="/gui2/?mode=browse&params=publication;31900248" target="_blank">Back-calculation of keratometer index based on OCT data and raytracing – a Monte Carlo simulation</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">99</span> <span class="journal-issue">8</span> <span class="page"> pp 843-849 </span> <span class="year">(2021)</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.14794" target="_blank" href="https://doi.org/10.1111/aos.14794"> DOI </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="000617103000001" target="_blank" href="https://www.webofscience.com/wos/woscc/full-record/000617103000001"> WoS </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="85100969546" target="_blank" href="http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85100969546"> Scopus </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="33576147" target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=33576147&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: 14</span> | Független: 3 | Függő: 11 | Nem jelölt: 0 | WoS jelölt: 11 | Scopus jelölt:&nbsp;14 | WoS/Scopus jelölt:&nbsp;14 | DOI jelölt:&nbsp;14 </div> <div class="publication-citation"> <a target="_blank" href="/api/publication?cond=citations.related;eq;31900248&sort=publishedYear,desc&sort=title"> Idézett közlemények száma: 5 </a> </div> <div class="mtid"><span class="long-pub-mtid">Közlemény: 31900248</span> | <span class="status-data status-ADMIN_APPROVED"> Admin láttamozott </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: 2022.01.16. 18:24 Pécsi Éva (MTMT Közp 2,3, admin) </div> <div class="lockedBy">Központi kezelésű 2021.05.28. 09:17 Boros Annamária (MTMT Központi admin) </div> </div></div>