Method for diagnosing and improving vision

A - Human Necessities – 61 – F

Patent

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A61F 9/01 (2006.01) A61B 3/107 (2006.01) A61F 9/009 (2006.01)

Patent

CA 2344586

Methods, and apparatus are disclosed for performing corneal ablation procedures of the eye (12) in a manner which does not interfere with the natural shape of the cornea or its orientation relative to the remainder of the eye, but which changes its surface curvature appropriately to achieve the required correction of vision. Three preferred embodiments are described, which model the cornea to different degrees of accuracy. Once the model of the cornea is obtained (610, 620, 630), surface curvature is modified (650) to achieve the degree of correction in refraction that is necessary, as determined by an eye test of the patient. The modified model of the cornea is then utilized to control the removal of material from the surface of the cornea in a corneal ablation operation.

L'invention porte sur des procédés et un appareil qui permettent d'effectuer une opération d'ablation cornéenne (12), sans altérer la forme naturelle de la cornée ou son orientation relativement au reste de l'oeil, mais de manière à modifier correctement sa sphéricité pour réaliser la correction visuelle requise. Trois formes d'exécution préférées sont décrites qui modélisent la cornée à différents degrés de précision. Une fois le modèle de la cornée réalisé (610, 620, 630), la sphéricité est modifiée (650) pour obtenir le degré de correction en réfraction nécessaire, tel que déterminé par un test oculaire effectué chez le patient. Le modèle de la cornée modifié est ensuite utilisé pour contrôler l'extraction de matière de la surface de la cornée pendant une opération d'ablation cornéenne.

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