Accommodating diffractive intraocular lens

A - Human Necessities – 61 – F

Patent

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A61F 2/16 (2006.01)

Patent

CA 2637007

A series of deformable, accommodating intraocular lenses is disclosed, where the series subtends a range of nominal powers . The capsular bag of the eye exerts a distorting force on the lens, thereby changing its power and allowing for accommodation. A full accommodation range is the lens power that brings a distant object into focus, subtracted from the lens power that brings a near object into focus. Each lens (10) in the series has essentially the same shape, which is optimized to maximize the accommodation range for a given distorting force. Typically, the lenses in the series have a meniscus shape, although plano-convex and bi-convex may also be used, in order to vary the nominal power for each lens in the series, without significantly affecting the accommodation range, a diffraction grating (13) is applied to one or both of the lens surfaces (11, 12) , where the grating power is different for each lens in the series.

La présente invention concerne une série de lentilles intraoculaires déformables à accommodation, dans laquelle la série sous-tend une gamme de puissances nominales. L'enveloppe capsulaire de l'AEil exerce une force de distorsion sur la lentille, modifiant ainsi sa puissance et permettant son accommodation. La distance d'accommodation totale est constituée par la puissance de lentille qui focalise un objet distant, soustraite à la puissance de lentille qui focalise un objet proche. Chaque lentille (10) dans la série a pratiquement la même forme, qui est optimisée pour maximiser la distance d'accommodation pour une force de distorsion donnée. Normalement, les lentilles dans la série ont une forme de ménisque, bien qu'il soit aussi possible d'utiliser des lentilles plano-convexes ou biconvexes, afin de varier la puissance nominale pour chaque lentille de la série, sans affecter de manière significative la distance d'accommodation, et un réseau de diffraction (13) est appliqué sur une ou les deux surfaces (11, 12) de lentille, le degré de diffraction étant différent pour chaque lentille de la série.

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