Multifocal lens, and method for production thereof

G - Physics – 02 – C

Patent

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

Patent

CA 2236097

Multifocal lens provided with a reading part disposed near the bottom part and another lens, such as a distance lens, near the top part. According to the invention, the outer limit of the reading part lies on or within the (outer) radius RV of the remaining part of the lens. This means that no thickening is needed for the reading part, and a particularly gradual transition between reading and distance part can be provided.

Cette invention concerne une lentille de contact multifocale, laquelle se compose d'une partie lecture située près de la partie inférieure de la lentille, ainsi que d'une autre lentille, telle qu'une lentille de vision lointaine, située vers la partie haut. D'après cette invention, la limite externe de la partie lecture correspond au rayon RV (externe) de la partie restante de la lentille, ou se situe à l'intérieur de ce rayon. Ce système permet d'éviter tout épaississement de la partie lecture, et d'obtenir une transition particulièrement graduelle entre la partie lecture et la partie vision lointaine.

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