| Título: | Corneal primary aberrations compensation by oblique light incidence |
| Autores: |
Espinosa Tomás, Julián Mas Candela, David Kasprzak, Henryk T. |
| Fecha: |
2009-09-04 2009-09-04 2009 2009-07 |
| Publicador: | RUA Docencia |
| Fuente: |
 |
| Tipo: | info:eu-repo/semantics/article |
| Tema: |
Astigmatism Angle kappa Ocular aberrations Óptica |
| Descripción: |
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 24(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. David Mas acknowledges the support of the Generalitat Valenciana through the project BEST-2008-148. Henryk T. Kasprzak acknowledges the University of Alicante for its financial support through the project Senior 08/07. |
| Idioma: | Inglés |
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