Optical comparison of multizone and single-zone photorefractive keratectomy

Xochitl Gonzalez-Cirre; Fabrice Manns; Pascal O. Rol; Jean-Marie A. Parel

doi:10.1117/12.275115

26 May 1997 Optical comparison of multizone and single-zone photorefractive keratectomy

Xochitl Gonzalez-Cirre, Fabrice Manns, Pascal O. Rol, Jean-Marie A. Parel

Proceedings Volume 2971, Ophthalmic Technologies VII; (1997) https://doi.org/10.1117/12.275115
Event: BiOS '97, Part of Photonics West, 1997, San Jose, CA, United States

Abstract

The purpose is to calculate and compare the point-spread function and the central ablation depth (CAD) of a paraxial eye model after photo-refractive keratectomy (PRK), with single and multizone treatments. A modified Le Grand-El Hage paraxial eye model, with a pupil diameter ranging from 2 to 8 mm was used. Ray-tracing was performed for initial myopia ranging from 1 to 10D; after single zone PRK; after double zone PRK; and after tripe zone PRK. The ray-tracing of a parallel incident beam was calculated by using the paraxial matrix method. At equal CAD, the optical image quality is better after single zone treatments. Multizone treatments do not seem to be advantageous optically.

Citation Download Citation

Xochitl Gonzalez-Cirre, Fabrice Manns, Pascal O. Rol, and Jean-Marie A. Parel "Optical comparison of multizone and single-zone photorefractive keratectomy", Proc. SPIE 2971, Ophthalmic Technologies VII, (26 May 1997); https://doi.org/10.1117/12.275115

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KEYWORDS

Point spread functions

Computer aided design

Eye models

Eye

Cornea

Image quality

Retina

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