Apparatus and method for objective measurement and...

A - Human Necessities – 61 – B

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A61B 3/103 (2006.01) A61F 9/01 (2006.01)

Patent

CA 2376111

A method for enhancing vision of an eye includes a laser delivery system having a laser beam for ablating corneal material from the cornea of the eye. Measurements are made to determine an optical path difference between a plane wave and a wavefront emanating from the retina of the eye for a location at a surface of the cornea. An optical correction is provided to the laser delivery system for the location based on the optical path difference and refractive indices of media through which the wavefront passes. The optical correction includes dividing the optical path difference by a difference between an index of refraction of corneal material and an index of refraction of air. The laser beam is directed to the location on the surface of the cornea and corneal material ablated at the location in response to the optical correction to cause the wavefront to approximate the shape of the plane wave at that location.

La présente invention concerne un procédé permettant d'améliorer la vision oculaire. Ce procédé utilise un système de diffusion laser à faisceau laser permettant l'ablation du tissu cornéen de l'oeil. On effectue des mesures pour déterminer une différence de trajet optique entre une onde plane et un front d'ondes provenant de la rétine pour une zone située à la surface de la cornée. On apporte une correction optique au système de diffusion laser pour ladite zone sur la base de la différence de trajet optique et des indices de réfraction du milieu traversé par le front d'ondes. Cette correction optique consiste à diviser la différence de trajet optique par la différence entre un indice de réfraction du tissu cornéen et l'indice de réfraction de l'air. On dirige le faisceau laser sur ladite zone située sur la surface de la cornée. Le tissu cornéen est supprimé au niveau de ladite zone en réponse à la correction optique, de manière à ce que le front d'ondes se rapproche de la forme de l'onde plane au niveau de ladite zone.

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