Development of an algorithm for corneal reshaping with a scanning laser beam

Fabrice Manns, Jin Hui Shen, Per Söderberg, Takaaki Matsui, Jean Marie Parel

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The corneal-ablation rate, the beam-intensity distribution, and the initial and the desired corneal topographies are used to calculate a spatial distribution map of laser pulses. The optimal values of the parameters are determined with a computer model, for a system that produces 213-nm radiation with a Gaussian beam-intensity distribution and a peak radiant exposure of 400 mJ/cm2. The model shows that with a beam diameter of 0.5 mm, an overlap of 80%, and a 5-mm treatment zone, the roughness is less than 6% of the central ablation depth, the refractive error after correction is less than 0.1 D for corrections of myopia of 1, 3, and 6 D and less than 0.4 D for a correction of myopia of 10 D, and the number of pulses per diopter of correction is 2500 when the beam-intensity distribution is Gaussian and 580 when it is flat.

Original languageEnglish (US)
Pages (from-to)4600-4608
Number of pages9
JournalApplied Optics
Volume34
Issue number21
DOIs
StatePublished - Jul 1995

Keywords

  • Cornea
  • Laser surgery
  • Model.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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