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Journal of Biomedical Optics

Corneal primary aberrations compensation by oblique light incidence
Author(s): Julian Espinosa; David Mas; Henryk T. Kasprzak
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Paper Abstract

The eye is not a centered system. The line of sight connects the fovea with the center of the pupil and is usually tilted in the temporal direction. Thus, off-axis optical aberrations, mainly coma and oblique astigmatism, are introduced at the fovea. Tabernero et al. [J. Opt. Soc. Am. A <b<24</b<(10), 3274-3283 (2007)] showed that a horizontal tilt of the crystalline lens generates a horizontal coma aberration that is compensated by the oblique light incidence on the eye. Here we suggest that corneal astigmatism may also play a role in compensation of oblique aberrations, and we propose a simple model to analyze such a possibility. A theoretical Kooijman eye model with a slight (~0.6 D) with-the-rule astigmatism is analyzed. Light rays at different incidence angles to the optical axis are considered, and the corresponding point spread functions (PSFs) at the retina are calculated. A quality criterion is used to determine the incidence angle that provides the narrowest and highest PSF energy peak. We show that the best image is obtained for a tilted incidence angle compatible with mean values of the angle kappa. This suggests that angle kappa, lens tilt, and corneal astigmatism may combine to provide a passive compensation mechanism to minimize aberrations on the fovea.

Paper Details

Date Published: 1 July 2009
PDF: 6 pages
J. Biomed. Opt. 14(4) 044003 doi: 10.1117/1.3158996
Published in: Journal of Biomedical Optics Volume 14, Issue 4
Show Author Affiliations
Julian Espinosa, Univ. de Alicante (Spain)
David Mas, Univ. de Alicante (Spain)
Henryk T. Kasprzak, Wroclaw Univ. of Technology (Poland)


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