Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1983-10-26
1986-07-22
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351177, G02C 704
Patent
active
046015566
ABSTRACT:
A contact lens for the eye of a patient with a keratoconus diseased cornea has a posterior surface comprised of three zones, each having a different radius of curvature. The innermost or first zone has a diameter slightly greater than the diameter of the diseased area of the cornea and has a radius of curvature which generally corresponds to but is slightly greater than the outward protrusion of the diseased cornea area. The second zone is generally annular and extends radially beyond the first zone. The second zone has a radius of curvature which is flatter than that of the first zone. The third zone, which is generally annular and extends radially beyond the second zone, has a radius of curvature which is flatter than that of the second zone. A fourth, generally annular, peripheral zone extending beyond the radial outer edge of the third zone may also be provided. The fourth zone includes an outwardly extending edge to facilitate the circulation of oxygen between the lens and the cornea.
REFERENCES:
patent: Re25286 (1962-11-01), DeCarle
patent: 2664025 (1953-12-01), Herman
patent: 3937566 (1976-02-01), Townsley
patent: 4103992 (1978-08-01), Breger
patent: 4171878 (1979-10-01), Kivaev et al.
patent: 4193672 (1980-03-01), Trombley
patent: 4199231 (1980-04-01), Evans
Marriott, P. J.; "Special Scleral Lenses"; Contacto; Mar. 1975; pp. 11-16.
Corbin John K.
Sugarman Scott J.
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