Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1977-03-07
1980-12-23
Clark, Conrad J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 702
Patent
active
042407192
ABSTRACT:
An eyeglass lens (ophthalmic lens) has in its upper section (far sight field) surface refraction values relative to far sight, and has in its lower section (near sight field) surface refraction values relative to near sight, and is divided into left and right sections by a line (main meridian), the points of which at least approximate geometric umbilical points (points of the same surface refraction value in the two main curvatures) in which a transition region (progression zone) is provided between the upper section and the lower section, in which the surface refraction values of the upper section change gradually into the surface refraction values of the lower section and in which all the lines of equal average refraction values of the upper section intersect the main meridian in the upper section and all the lines of the lower section intersect the main meridian in the lower section and all are extended on both ends to the periphery of the eyeglass lens. All lines of equal average surface refaction value of the progression zone intersect the main meridian in the progression zone and extend to the lens periphery. Such lens compensates for a missing power of accommodation of the human eye or one that is reduced in presbyopic age.
REFERENCES:
patent: 2878721 (1959-03-01), Kanolt
patent: 3687528 (1972-08-01), Maitenaz
patent: 3910691 (1975-10-01), Maitenaz
Barth Rudolf
Guilino Gunter
Clark Conrad J.
Cohen Jerry
Optisch Werke G. Rodenstock
LandOfFree
Progressive 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 ophthalmic lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Progressive ophthalmic lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2239829