Bifocal contact lens with secondary prism

Details Bifocal contact lens with secondary prism Bifocal contact lens with secondary prism

G - Physics

02

C

G02C 7/04 (2006.01) G02C 7/06 (2006.01)

Patent

CA 2454657

A soft prism bifocal contact lens (10) that provides optimal vi sion for both distance and near objects by incorporating two or more prisms into the same lens. One or more primary prisms (12) are used to achieve a desired vertical lens positioning on the eye and to control meridional rotation. In addition, one or more secondary prisms (14) are used to achieve vertical lens shifting so that the desired optical power zone (16,17) of the contact lens (10) is brought before the entrance pupil (26) of the eye at the desired time.

L'invention concerne des lentilles (10) de contact bifocales à prisme mou qui offrent une vision optimale d'objets à distance et à proximité par incorporation d'au moins deux prismes dans la même lentille. Au moins un prisme (12) principal permet d'obtenir le positionnement vertical voulu de la lentille sur l'oeil et de réguler la rotation méridienne. En outre, au moins un prisme (14) secondaire permet d'obtenir un décentrement vertical de la lentille de façon à amener la zone (16,17) de puissance optique voulue de la lentille (10) de contact devant la pupille (26) d'entrée de l'oeil au moment voulu.

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