Toric intraocular lens with spatially-variant astigmatism

G - Physics – 02 – C

Patent

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G02C 7/04 (2006.01) A61F 2/16 (2006.01)

Patent

CA 2716243

An intraocular lens for correcting or reducing the astigmatism of a cornea includes a pupil that is spatially divided into discrete zones, with each zone having a particular astigmatism magnitude and astigmatism orientation. In one embodiment, the zones all have the same astigmatism magnitude, which is equal and opposite the cornea astigmatism magnitude to within a par-ticular tolerance, such as 0.25 diopters. In one embodiment, some or all of the zones all have different astigmatism orientations, with the angular separation between astigmatism orientations being on the order of the rotational misalignment tolerance of the lens to the cornea. The visual performance of such a lens deteriorates more slowly with rotational misalignment, when compared to a comparable lens having a uniform astigmatism orientation across its entire pupil, leading to more relaxed tolerances for a sur-geon that implants the lens.

Une lentille intra-oculaire pour corriger ou réduire lastigmatisme dune cornée inclut une pupille qui est divisée spatialement en zones discrètes, chaque zone ayant une grandeur dastigmatisme particulière et une orientation dastigmatisme particulière. Dans un mode de réalisation, les zones ont toutes la même grandeur dastigmatisme, qui est égale et opposée à la grandeur dastigmatisme de la cornée à une tolérance particulière près, telle que 0,25 dioptrie. Dans un mode de réalisation, toutes les zones ou partie des zones ont des orientations dastigmatisme différentes, la séparation angulaire entre les orientations dastigmatisme étant de lordre de la tolérance de désalignement en rotation de la lentille à la cornée. La performance visuelle dune telle lentille se détériore plus lentement avec un désalignement en rotation, en comparaison à une lentille comparable ayant une orientation dastigmatisme uniforme à travers sa pupille entière, conduisant à des tolérances plus larges pour un chirurgien qui implante la lentille.

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