Gas-permeable lens

Details Gas-permeable lens Gas-permeable lens

1979-03-05

1980-08-12

Griffin, Ronald W.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

264 1, 536 58, 536 65, 536 84, 536 87, 536 90, 536100, G02C 704

Patent

active

RE0303682

ABSTRACT:
This invention comprises a gas-permeable contact lens consisting essentially of a plasticized cellulose resin selected from a partially esterified or partially etherified cellulose polymer plasticized with a compatible plasticizer in an amount sufficient to increase the gas permeability of the cellulose resin.

REFERENCES:
patent: 2241415 (1941-05-01), Moulton
patent: 2242372 (1941-05-01), Schneider
patent: 2607703 (1952-08-01), Resch et al.
patent: 2670302 (1954-02-01), Malm et al.
patent: 2710811 (1955-06-01), DeCroes et al.
patent: 2763562 (1956-09-01), Meyer et al.
patent: 2840484 (1958-06-01), Gerbaux
patent: 2942994 (1960-06-01), Proell et al.
patent: 3220865 (1965-11-01), Coney
patent: 3551035 (1970-12-01), Kamath
patent: 3608057 (1971-09-01), Bixler et al.
patent: 3622362 (1971-11-01), Coney et al.
patent: 3808179 (1974-04-01), Gaylord
patent: 3900250 (1975-08-01), Ivani
patent: 3940207 (1976-02-01), Barkdoll
patent: 3973561 (1976-08-01), Kane
Zimmerman & Lavine, Industrial Research Service's Handbook of Material Trade Names, Dover, New Hampshire, 1953, p. 560.

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