Calculation of laser pulse distribution maps for corneal reshaping with a scanning beam

Fabrice Manns; Jin-Hui Shen; Per G. Soederberg; Takaaki Matsui; Jean-Marie A. Parel

doi:10.1117/12.209849

22 May 1995 Calculation of laser pulse distribution maps for corneal reshaping with a scanning beam

Fabrice Manns, Jin-Hui Shen, Per G. Soederberg, Takaaki Matsui, Jean-Marie A. Parel

Proceedings Volume 2393, Ophthalmic Technologies V; (1995) https://doi.org/10.1117/12.209849
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

A method for calculating pulse distribution maps for scanning laser corneal surgery is presented. The accuracy, the smoothness of the corneal shape, and the duration of surgery were evaluated for corrections of myopia by using computer simulations. The accuracy and the number of pulses were computed as a function of the beam diameter, the diameter of the treatment zone, and the amount of attempted flattening. The ablation is smooth when the spot overlap is 80% or more. The accuracy does not depend on the beam diameter or on the diameter of the ablation zone when the ablation zone is larger than 5 mm. With an overlap of 80% and an ablation zone larger than 5 mm, the error is 5% of the attempted flattening, and 610 pulses are needed per Diopter of correction with a beam diameter of 1 mm. Pulse maps for the correction of astigmatism were computed and evaluated. The simulations show that with 60% overlap, a beam diameter of 1 mm, and a 5 mm treatment zone, 6 D of astigmatism can be corrected with an accuracy better than 1.8 D. This study shows that smooth and accurate ablations can be produced with a scanning spot.

Citation Download Citation

Fabrice Manns, Jin-Hui Shen, Per G. Soederberg, Takaaki Matsui, and Jean-Marie A. Parel "Calculation of laser pulse distribution maps for corneal reshaping with a scanning beam", Proc. SPIE 2393, Ophthalmic Technologies V, (22 May 1995); https://doi.org/10.1117/12.209849

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