A series of aspherical contact lenses

Details A series of aspherical contact lenses A series of aspherical contact lenses

G - Physics

02

C

G02C 7/04 (2006.01)

Patent

CA 2583796

The present invention provides a series of aspherical contact lenses, each lens having a first central optical zone on its anterior surface and a second central optical zone on its posterior surface. Both central optical zones are aspherical surfaces. The first central optical zone is designed to have a surface which provides a target optical power and an optical power profile selected from the group consisting of (a) a substantially constant optical power profile, (b) a power profile mimicking the optical power profile of a spherical lens with an identical targeted optical power, and (c) a power profile in which lens spherical aberration at 6 mm diameter is from about 0.65 diopter to about 1.8 diopters more negative than spherical aberration at 4 mm diameter.

La présente invention concerne une série de lentilles de contact asphériques présentant chacune une première zone optique centrale sur la surface antérieure et une seconde zone optique sur la surface postérieure. Les deux zones optiques centrales présentent des surfaces asphériques. De par sa conception, la première zone optique a une surface qui fournit une puissance optique cible et un profil de puissance optique pris dans le groupe comprenant (à) un profil de puissance optique sensiblement constant, (b) un profil de puissance rappelant le profil de puissance optique d'une lentille sphérique dotée d'une puissance optique cible identique, et (c) un profil de puissance dans lequel l'aberration sphérique de la lentille à un diamètre de 6 mm est plus négative d'environ 0,65-1,8 dioptrie que l'aberration sphérique à un diamètre de 4 mm.

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