Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1989-11-29
1991-09-24
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
359708, G02C 702, G02B 304
Patent
active
050509799
ABSTRACT:
An improved eyeglass lens which includes a front and back surface, one of which is refractive surface. The lens is defined by a meridian on the refractive surface which substantially increases for at least 15 mm in the direction of the outer periphery of the lens from the optical axis. The change in curvature of the meridian may remain constant within the at least 5 mm from the optical axis. The curvature of the meridian is represented by C(r) as a function of a distance r from the optical axis, and the linear differential coefficient dc/dr of the function C may increase at least once and then decrease as the distance from the optical axis increases providing a thinner lens edge to improve lens appearance while maintaining superior optical efficiency.
REFERENCES:
patent: 4289387 (1981-09-01), Jalie
patent: 4561736 (1985-12-01), Furter et al.
patent: 4613217 (1986-09-01), Fuerter et al.
Seiko Epson Corporation
Sugarman Scott J.
LandOfFree
Eyeglass 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 Eyeglass lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Eyeglass lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1693253