Academic Journal
Translation model for CW chord to angle Alpha derived from a Monte-Carlo simulation based on raytracing.
Title: | Translation model for CW chord to angle Alpha derived from a Monte-Carlo simulation based on raytracing. |
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Authors: | Langenbucher, Achim, Szentmáry, Nóra, Cayless, Alan, Weisensee, Johannes, Wendelstein, Jascha, Hoffmann, Peter |
Source: | PLoS ONE; 5/16/2022, Vol. 17 Issue 5, p1-13, 13p |
Abstract: | 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: Pup |
Subject Terms: | MONTE Carlo method, ANGLES, ANTERIOR eye segment, PREDICTION models, CORNEA |
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ISSN: | 19326203 |
DOI: | 10.1371/journal.pone.0267028 |
Database: | Complementary Index |
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