Contact lens and process for the manufacture thereof

Details Contact lens and process for the manufacture thereof Contact lens and process for the manufacture thereof

1991-01-17

1992-11-24

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

051667100

ABSTRACT:
A contact lens that consists of gas-permeable, especially oxygen-permeable, lens material and has a supporting edge which rests on the sclera and is covered at least partially by both eyelids and absorbs the forces acting on the lens as the lid closes, the rear face of the lens in the region of the cornea being spaced from the surface of the cornea. By ensuring the exchange of lachrymal fluid between the contact lens and the surface of the eye, metabolic products are transported away and the supply of oxygen to the cornea is assisted. For that purpose, channels may be provided on the lens or the lens may be caused to rotate.

REFERENCES:
patent: 3594074 (1971-07-01), Rosen
patent: 4171878 (1979-10-01), Kivaev et al.
patent: 4180308 (1979-12-01), Mancini et al.
patent: 4193672 (1980-03-01), Trombley et al.
patent: 4239353 (1980-12-01), Koller
patent: 4640594 (1987-02-01), Berger
patent: 4820038 (1989-04-01), Seger
patent: 4890911 (1990-01-01), Sulc et al.

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