Contact lens with a back surface having second-order portions

Details Contact lens with a back surface having second-order portions Contact lens with a back surface having second-order portions

1986-03-11

1988-08-23

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351161, G02C 704

Patent

active

047657286

ABSTRACT:
A contact lens having a back surface comprising a central zone and at least one marginal zone. The central zone and the marginal zone being each constituted by portions of second-order surfaces of revolution other than spherical. The transition from the central to the marginal zone is tangential, and in the marginal zone, the axial clearance between the cornea and the back surface increases in direction towards the edge of the lens.

REFERENCES:
patent: 3482906 (1969-12-01), Volk
patent: 3950082 (1976-04-01), Volk
patent: 4418991 (1983-12-01), Breger
patent: 4525043 (1985-06-01), Bronstein
patent: 4640595 (1987-02-01), Volk

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