Progressive multifocal ophtalmic lens

Details Progressive multifocal ophtalmic lens Progressive multifocal ophtalmic lens

G - Physics

02

C

G02C 7/06 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2110926

A progressive multifocal ophtalmic lens is provided having an aspherical surface comprising a distance vision portion, a near vision portion and an intermediate vision portion, in which the maximum mean sphere gradient value is situated in the intermediate vision portion of the principal meridian of progression of the lens, and the cylinder gradient over the whole aspherical surface of the lens is less than the product obtained by multiplying the power addition value at each point by a constant value coefficient.

Une lentille ophtalmique à foyers progressifs a une surface asphérique comportant une partie pour vision éloignée, une partie pour vision rapprochée et une partie pour vision intermédiaire, et sa valeur moyenne maximale de gradient sphérique se situe dans la partie pour vision intermédiaire du méridien principal de progression de la lentille, et le gradient cylindrique pour l'ensemble de la surface asphérique est inférieur au produit obtenu en multipliant la valeur d'addition en puissance à chaque point par un coefficient de valeur constante.

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