https://m2.mtmt.hu/ hun 2026-06-27 19:38 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 Folyóiratcikk Journal Article 24 7 Könyvrészlet Chapter in Book 25 0 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 2023 0 1 1 1 1 2024 0 1 0 1 0 2025 0 4 2 4 2 2026 0 1 1 1 1 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 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/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>