Forward ray tracing for image projection prediction and surface reconstruction in the evaluation of corneal topography systems

J.J. Snellenburg, B. Braaf, E.A. Hermans, R.G.L. van der Heijde, V.A. Sicam

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Abstract

A forward ray tracing (FRT) model is presented to determine the exact image projection in a general corneal topography system. Consequently, the skew ray error in Placido-based topography is demonstrated. A quantitative analysis comparing FRT-based algorithms and Placido-based algorithms in reconstructing the front surface of the cornea shows that arc step algorithms are more sensitive to noise (imprecise). Furthermore, they are less accurate in determining corneal aberrations particularly the quadrafoil aberration. On the other hand, FRT-based algorithms are more accurate and more precise showing that point to point corneal topography is superior compared to its Placido-based counterpart. © 2010 Optical Society of America.
Original languageEnglish
Pages (from-to)19324-19338
Number of pages15
JournalOptics Express
Volume18
Issue number18
DOIs
Publication statusPublished - 2010

Bibliographical note

Republished in Virtual Journal for Biomedical Optics: http://www.opticsinfobase.org/VJBO/abstract.cfm?uri=oe-18-18-19324

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