Optimization of ablation correction of an optical system and...

A - Human Necessities – 61 – F

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A61F 9/01 (2006.01) A61B 5/103 (2006.01)

Patent

CA 2375163

An optical correction system for correcting visual defects of an eye includes a wavefront analyzer responsive to a wavefront emanating from an eye for determining an optical path difference between a reference wave and the wavefront. A converter provides an optical correction based on the path difference and on a radially dependent ablation efficiency. The efficiency correction uses a compensating polynomial of the form A + B.rho. + C.rho.2 + D.rho.3 +...+ X.rho.n, where .rho. is a normalized radius measured from a central portion of the cornea, reaching a value of 1 at an outer edge of the optical correction zone. A laser beam is directed to the cornea that has power sufficient for ablating corneal material. The optical correction is achieved by the removal of a selected amount of the corneal material to cerate a desired corneal shape change based on the optical correction.

L'invention concerne un système de correction optique servant à corriger des défauts visuels d'un oeil, comprenant un analyseur de front d'onde sensible à un front d'onde provenant d'un oeil et servant à déterminer une différence de chemin optique entre une onde de référence et le front d'onde. Un convertisseur fournit une correction optique sur la base de la différence de chemin et d'une efficacité d'ablation dépendant du rayon. La correction d'efficacité utilise un polynôme de compensation représenté par la forme <I>A</I> + B.rho. + C.rho.?2¿ + D.rho.?3¿ + + X.rho.?n¿, .rho. représentant le rayon normalisé mesuré d'une partie centrale de la cornée, atteignant une valeur de 1 à un bord extérieur de la zone de correction optique. Un faisceau laser est dirigé sur la cornée, ce faisceau présentant une puissance suffisante pour produire une ablation de matière cornéenne. La correction optique est obtenue par l'élimination d'une quantité sélectionnée de matière cornéenne de façon à modifier la forme cornéenne selon les besoins de correction.

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