G - Physics – 02 – C
Patent
G - Physics
02
C
G02C 7/06 (2006.01) G02C 7/02 (2006.01)
Patent
CA 2161560
A progressive multifocal ophthalmic lens is provided comprising an aspherical surface having a mean sphere and a cylinder at every point. The aspherical surface comprises a distance vision portion, with a control point for distance vision, a near vision portion with a control point for near vision, and an intermediate vision portion between the near vision portion and the distance vision portion. A power addition value A is defined as a variation in mean sphere between the control point for distance vision and the control point for near vision portion. A base B is defined as a value of mean sphere at the control point for distance vision. A width of the near vision portion varies not only as a function of the power addition value A, but also as a function of the value B of the base. The invention thereby ensures the presence of a substantially constant object field for all values of the power addition and of the base.
Ahsbahs Francoise
Pedrono Claude
Essilor International - Compagnie Generale D'optique
Sim & Mcburney
LandOfFree
Progressive multifocal ophthalmic lens does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Progressive multifocal ophthalmic lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Progressive multifocal ophthalmic lens will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1982037