Presbyopic contact lens

Details Presbyopic contact lens Presbyopic contact lens

1980-06-09

1983-12-06

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704, G02C 706

Patent

active

044189915

ABSTRACT:
A contact lens to correct presbyopia provides a distance correction at the center, increasing diopter adds away from the center for close and intermediate viewing and a good physical fit. The lens has a generally spherical anterior surface and a posterior surface with an annular fitting region for good physical fit and an optical region having a central portion providing a distance correction and a paracentral portion providing a gradient of diopter adds for close and intermediate viewing

REFERENCES:
patent: Re25286 (1962-11-01), De Carle
patent: 3187338 (1965-06-01), Neefe
patent: 3227507 (1966-01-01), Feinbloom
patent: 3344692 (1967-10-01), Volk
patent: 3482906 (1969-12-01), Volk
patent: 3535825 (1970-10-01), Volk
patent: 3772832 (1973-11-01), Smith
patent: 3950082 (1976-04-01), Volk
patent: 4149801 (1979-04-01), Volk
patent: 4195919 (1980-04-01), Shelton
Defazio et al., "Inspection of Back Surface Aspheric Contact Lenses", Am. J. of Optometry, vol. 56, No. 8, Aug. 1979, pp. 471-479.
Goldberg, J. B., "Eccentricity Values of Corneal Lenses", Optometric Weekly, vol. 67, No. 14, Apr. 1976.

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