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

Fabrice Manns; Arthur Ho; Jean-Marie Parel

doi:10.1117/12.540883

13 July 2004 Effect of the internal optics on the outcome of custom-LASIK in an eye model

Fabrice Manns, Arthur Ho, Jean-Marie Parel

Proceedings Volume 5314, Ophthalmic Technologies XIV; (2004) https://doi.org/10.1117/12.540883
Event: Biomedical Optics 2004, 2004, San Jose, CA, United States

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.

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Fabrice Manns, Arthur Ho, and Jean-Marie Parel "Effect of the internal optics on the outcome of custom-LASIK in an eye model", Proc. SPIE 5314, Ophthalmic Technologies XIV, (13 July 2004); https://doi.org/10.1117/12.540883

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KEYWORDS

Monochromatic aberrations

Eye models

Eye

Cornea

Surgery

Wavefront aberrations

3D modeling

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