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Proceedings Paper

Effect of the internal optics on the outcome of custom-LASIK in an eye model
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Paper Abstract

Purpose. The purpose of this study was to evaluate if changes in the aberration-contribution of the internal optics of the eye have a significant effect on the outcome of wavefront-guided corneal reshaping. Methods. The Navarro-Escudero eye model was simulated using optical analysis software. The eye was rendered myopic by shifting the plane of the retina. Custom-LASIK was simulated by changing the radius of curvature and asphericity of the anterior corneal surface of the eye model. The radius of curvature was adjusted to provide a retinal conjugate at infinity. Three approaches were used to determine the postoperative corneal asphericity: minimizing third-order spherical aberration, minimizing third-order coma, and maximizing the Strehl ratio. The aberration contribution of the anterior corneal surface and internal optics was calculated before and after each simulated customized correction. Results. For a 5.2mm diameter pupil, the contribution of the anterior corneal surface to third-order spherical aberration and coma (in micrometers) was 2.22 and 2.49 preop, -0.36 and 2.83 postop when spherical aberration is minimized, 5.88 and 1.10 postop when coma is minimized, and -0.63 and 2.91 postop when Strehl ratio is maximized. The contribution of the internal optics of the eye to spherical aberration and coma for the same four conditions was: 0.43 and -1.13, 0.37 and -1.10, 0.37 and -1.10 and 0.37 and -1.10, respectively. Conclusion. In the model eye, the contribution of the internal optics of the eye to the change in the ocular aberration state is negligible.

Paper Details

Date Published: 13 July 2004
PDF: 5 pages
Proc. SPIE 5314, Ophthalmic Technologies XIV, (13 July 2004); doi: 10.1117/12.540883
Show Author Affiliations
Fabrice Manns, Univ. of Miami School of Medicine (United States)
Univ. of Miami (United States)
Arthur Ho, Vision Cooperative Research Ctr. (Australia)
Univ. of New South Wales (Australia)
Jean-Marie Parel, Univ. of Miami School of Medicine (United States)
Univ. of Miami (United States)


Published in SPIE Proceedings Vol. 5314:
Ophthalmic Technologies XIV
Fabrice Manns; Per G. Soderberg; Arthur Ho, Editor(s)

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