Three-dimensional ray-tracing model for the study of advanced refractive errors in keratoconus

We propose a numerical three-dimensional (3D) ray-tracing model for the analysis of advanced corneal refractive errors. The 3D modeling was based on measured corneal elevation data by means of Scheimpflug photography. A mathematical description of the measured corneal surfaces from a keratoconus (KC...

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Bibliographic Details
Published in:Applied optics (2004) 2016-01, Vol.55 (3), p.507-514
Main Authors: Schedin, Staffan, Hallberg, Per, Behndig, Anders
Format: Article
Language:English
Subjects:
Cornea - pathology
Customizing
Elevation
Error analysis
Humans
Imaging, Three-Dimensional
Keratoconus - complications
Keratoconus - pathology
Mathematical models
Models, Theoretical
Optical Phenomena
Photography
Refraction
Refractive Errors - complications
Refractive Errors - pathology
Three dimensional
Three dimensional models
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Summary:We propose a numerical three-dimensional (3D) ray-tracing model for the analysis of advanced corneal refractive errors. The 3D modeling was based on measured corneal elevation data by means of Scheimpflug photography. A mathematical description of the measured corneal surfaces from a keratoconus (KC) patient was used for the 3D ray tracing, based on Snell's law of refraction. A model of a commercial intraocular lens (IOL) was included in the analysis. By modifying the posterior IOL surface, it was shown that the imaging quality could be significantly improved. The RMS values were reduced by approximately 50% close to the retina, both for on- and off-axis geometries. The 3D ray-tracing model can constitute a basis for simulation of customized IOLs that are able to correct the advanced, irregular refractive errors in KC.
ISSN:1559-128X
2155-3165
2155-3165
DOI:10.1364/ao.55.000507