Method of making polymeric contact lens

Details Method of making polymeric contact lens Method of making polymeric contact lens

1975-07-23

1976-04-20

Rubin, David H.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160, 264 1, 526 73, 526200, 526213, 526320, G02C 704, G02B 104

Patent

active

039515281

ABSTRACT:
The present application discloses a polymeric plastic material suitable for contact lenses. It is made from a monomer having the formula ##EQU1## wherein n is 2 or 3, in the substantial absence of diunsaturated and polyunsaturated monomers. The mixture subjected to polymerization may also contain as an additional comonomer a compound having the formula ##EQU2## wherein R is hydrogen or CH.sub.3, and R' is a lower alkyl group, or a group (C.sub.2 H.sub.4 O).sub.m H where m is an integer of at least 1. The application also discloses a post-heating or post-curing step, the machining of the plastic into contact lenses followed by washing in dilute alkali to neutralize any residual acid material within the plastic, followed in turn by heating in normal saline or isotonic solution to make the lens compatible with the eyeball.

REFERENCES:
patent: 3361858 (1968-01-01), Wichterle
patent: 3496254 (1970-02-01), Wichterle
patent: 3503942 (1970-03-01), Seiderman
patent: 3520949 (1970-07-01), Shepherd et al.
patent: 3660545 (1972-05-01), Wichterle

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