Contact lens having a smooth surface layer of a hydrophilic poly

Details Contact lens having a smooth surface layer of a hydrophilic poly Contact lens having a smooth surface layer of a hydrophilic poly

1976-12-27

1978-07-11

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

20415913, 351177, 427 36, G02C 704, C08F 254

Patent

active

040998592

ABSTRACT:
A contact lens comprising a silicone polymer or copolymer core and a hydrophilic polymer surface grafted to the core is formed by contacting a silicone with a free radical polymerizable precursor to the polymer in a liquid state and subjecting the precursor and silicone to a high dose of ionizing radiation for a short period. The radiation dose, time of radiation and temperature are controlled to produce an optically clear contact lens by forming a smooth surface of the polymer grafted to the silicone, preventing substantial migration of the precursor into the silicone and preventing localized high concentration of hydrophilic polymer on the silicone surface.

REFERENCES:
patent: 3621079 (1971-11-01), Leeds
patent: 3700573 (1972-10-01), Laizier et al.
patent: 3700761 (1972-10-01), O'Driscoll et al.
patent: 3745042 (1973-07-01), Lim et al.
patent: 3916033 (1975-10-01), Merrill

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