Contact lens having a hard center and soft, tough periphery

Details Contact lens having a hard center and soft, tough periphery Contact lens having a hard center and soft, tough periphery

1974-02-26

1976-03-16

Rubin, David H.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

260 875A, G02C 704

Patent

active

039443477

ABSTRACT:
Disclosed is a segmented contact lens for the human eye constructed from fluorine-containing polymers, said lens having an index of refraction approximating that of tears and being characterized by a hard center segment surrounded by a soft tough periphery, the hard center having a Knoop hardness of at least 2 and the soft, tough periphery having a Clash-Berg torsion modulus of 95-1,000 lb/sq. in.

REFERENCES:
patent: 3132123 (1964-05-01), Harris et al.
patent: 3308107 (1967-03-01), Selman et al.
patent: 3484503 (1969-12-01), Magner et al.
patent: 3542461 (1970-11-01), Girard et al.
patent: 3808179 (1974-04-01), Gaylord

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