Corneal topography-based target warping

A - Human Necessities – 61 – F

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A61F 9/01 (2006.01)

Patent

CA 2489343

Systems and methods for treating a tissue of an eye with a laser beam include at least one processor that determines angles between a curved surface and a laser beam, controlling an ablative treatment in response to the angles. Angles between a surface of a cornea and a laser beam may be mapped over a treatment area. A mapped area may include an apex of a cornea displaced from a center of a pupil of an eye. Ablation properties may be determined locally in response to the incident angle of a laser beam with respect to a local slope of a tissue surface. The treatment area may be ablated using local ablation properties to form a desired surface shape.

L'invention concerne des systèmes et des procédés permettant de traiter un tissu de l'oeil au moyen d'un faisceau laser, qui consistent notamment en un processeur qui détermine les angles entre une surface courbe et un faisceau laser, contrôlant un traitement ablatif en réponse aux angles. Les angles entre une surface d'une cornée et un faisceau laser peuvent être cartographiés sur une zone de traitement. Une zone cartographiée peut comporter l'apex d'une cornée déplacée du centre de la pupille d'un oeil. Les propriétés d'ablation peuvent être déterminées localement en réponse à l'angle incident d'un faisceau laser par rapport à une pente locale d'une surface tissulaire. La zone de traitement peut être ablatée à l'aide des propriétés d'ablation de façon à obtenir la forme superficielle voulue.

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