Eyeglass lenses for persons suffering from severe ametropia

Details Eyeglass lenses for persons suffering from severe ametropia Eyeglass lenses for persons suffering from severe ametropia

1983-07-29

1985-12-31

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350432, G02B 304, G02C 702

Patent

active

045617368

ABSTRACT:
Eyeglass lenses for persons suffering from severe ametropia. The lenses have a convexly shaped object-side front surface (4) and an eye-side rear surface (3) which is aspherically corrected in the central region (6) which comprises at least the main field of view. From this region the rear surface passes into a region in which its meridional inclination approaches the inclination of the front surface. The entire rear surface of the lens is continuously differentiable twice. Such a lens has an appearance which is fully satisfactory esthetically and makes it possible to keep the overall magnification of the system consisting of the eye and the eyeglass lens closer to 1 than in the case of previously known lenses. Aberrations are optimally corrected within a sufficiently large region, and no disturbing discontinuities in the fields of view occur.

REFERENCES:
patent: 3950082 (1976-04-01), Volk
patent: 4279480 (1981-07-01), Bettiol et al.

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