Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1997-10-22
1999-09-14
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351171, G02C 706
Patent
active
059530995
ABSTRACT:
A non-progressive multi-focal ophthalmic lens having a first arcuate area for distance viewing and a second arcuate segment, whereby the first area and second segment share a seamless transition corridor that does not obstruct or distort vision when shifting the eyes between the first area and second segment. The second segment is substantially C-shaped and defines the transition corridor at its top end. The second segment has a smaller radius of curvature than the first area and shares a common tangential component with the first area. The first area and reading segment are designed and manufactured in a way that eliminates the dividing line, image jump and distortion when moving the eyes between distance and near vision areas and obstructions to peripheral and downward vision.
REFERENCES:
patent: 4806010 (1989-02-01), Ewer et al.
patent: 4869588 (1989-09-01), Frieder et al.
patent: 5305028 (1994-04-01), Okano
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