Share Email Print
cover

Proceedings Paper

Calculation of laser pulse distribution maps for corneal reshaping with a scanning beam
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper 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.

Paper Details

Date Published: 22 May 1995
PDF: 7 pages
Proc. SPIE 2393, Ophthalmic Technologies V, (22 May 1995); doi: 10.1117/12.209849
Show Author Affiliations
Fabrice Manns, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)
Jin-Hui Shen, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)
Per G. Soederberg, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)
Takaaki Matsui, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)
Jean-Marie A. Parel, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)
Univ. de Paris Hopital de l'Hotel-Dieu (France)


Published in SPIE Proceedings Vol. 2393:
Ophthalmic Technologies V
Jean-Marie Parel; Qiushi Ren; Karen Margaret Joos, Editor(s)

© SPIE. Terms of Use
Back to Top