Flexible contact lens

Details Flexible contact lens Flexible contact lens

1975-11-18

1977-12-13

Rubin, David H.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

040626270

ABSTRACT:
An improved flexible contact lens is provided having hydrophilic and lipophobic properties which allow extended duration of wear by eliminating or greatly reducing the risk of rupture of the natural tear film produced by the cornea. These properties are achieved by crosslinking a selected water soluble polymer which has been grafted onto a pre-formed substrate, for example crosslinking polyvinyl pyrrolidone which has been previously grafted onto a silicone substrate. The grafting and the crosslinking are accomplished in separate stages.

REFERENCES:
patent: 3228741 (1966-01-01), Becker
patent: 3700573 (1972-10-01), Laizier et al.
patent: 3750272 (1973-08-01), Gomond
patent: 3761208 (1973-09-01), Boudet et al.
patent: 3808113 (1974-04-01), Okamura et al.
patent: 3916033 (1975-10-01), Merrill
patent: 3925178 (1975-12-01), Gesser et al.

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