Apparatus and method for performing presbyopia corrective...

A - Human Necessities – 61 – F

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A61F 9/007 (2006.01) A61F 7/00 (2006.01) A61F 9/01 (2006.01)

Patent

CA 2353689

A system, and process for correcting presbyopia with the system including a tissue removal system that preferably includes a laser system (200) with means (206) for forming a predetermined presbyopia correction contour corresponding to a predetermined ablation profile through controlled ablation on an exposed corneal stroma area of the eye, such that a central zone (A) of about 1 mm to 3 mm or more preferably 1.4 mm to 1.8 mm is left intact with a main maximum presbyopia ablation zone (B) bordering the untouched or hardly touched (e.g., a radius transition edge) central zone. The annular maximum ablation zone in the stroma is defined by a smoothly curving, steep profile section which extends out from a central non-ablation zone section of the profile. Further outward from the maximum ablation zone in the stroma is an annular treatment zone that is determined by a further section of the presbyopia correcting profile generally represented by a smoothing transition section that extends into another zone which is an un-ablated zone.

Système et technique permettant de corriger la presbytie comprenant un système d'élimination des tissus comportant de préférence un dispositif au laser (200) et des moyens (206) permettant de former un contour de correction de presbytie prédéterminé, correspondant à un profil d'ablation prédéterminé, par ablation contrôlée d'une zone du stroma de la cornée de l'oeil, telle qu'une zone centrale (A) d'environ 1 à 3 mm, et de préférence de 1,4 à 1,8 mm, est laissée intacte avec un zone d'ablation de presbytie maximale (B) longeant la zone centrale laissée intacte ou à peine touchée (p.ex. un bord radial de transition). La zone annulaire d'ablation maximale dans le stroma est définie par une section a forte pente, puis légèrement incurvée, se prolongeant vers l'extérieur, à partir de la zone de non ablation du profil. Plus loin, à l'extérieur de la zone d'ablation maximale, est située une zone de traitement définie par une autre section du profil de correction de presbytie et généralement représentée par une section de transition progressive s'étendant jusqu'à une autre zone de non ablation.

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