Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1976-10-12
1978-09-05
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
041115350
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.
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Zimmerman & Lavine, Industrial Research Service's Handbook of Material Trade Names, Dover, New Hampshire, 1953, p. 560.
Loshaek Samuel
Shen Chah M.
Griffin Ronald W.
Wesley-Jessen Inc.
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