Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1997-03-12
1999-01-26
Epps, Georgia
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 706
Patent
active
058643800
ABSTRACT:
A progressive power eyeglass lens is disclosed. The lens is particularly suitable for close-range work while facilitating distinct vision up to a specific distance that is substantially separated from the close-view distance. The lens also provides a wide distinct-vision area in the near-vision region. The lens comprises a near-vision correction region with a surface refractive power suitable for near vision, a specific-distance-vision correction region with a surface refractive power suitable for a specific distance that is substantially separated from the close-view distance, and a progressive zone between the near-vision correction region and the specific-distance-vision correction region that provides a gradual change in refractive index from the near-vision correction region to the specific-distance-vision correction region. The length of the progressive zone from the center of the specific-distance-vision correction region to the center of the near-vision correction region is at least 15 mm, and the minimum width of the distinct-vision area in the near-vision correction region is at least 5 times the minimum width of the distinct-vision area in the progressive zone.
REFERENCES:
patent: 4762408 (1988-08-01), Shinohara
patent: 4955712 (1990-09-01), Barth et al.
patent: 5123725 (1992-06-01), Winthrop
patent: 5708493 (1998-01-01), Ahsbahs et al.
Epps Georgia
Nikon Corporation
Schwartz Jordan M.
LandOfFree
Progressive power 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 power lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Progressive power lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1453987