Method of producing annealed polyvinyl alcohol contact lens

Details Method of producing annealed polyvinyl alcohol contact lens Method of producing annealed polyvinyl alcohol contact lens

1984-07-26

1986-10-28

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonmechanical aftertreatment

264 11, 264 27, 351160H, 523106, 525 61, 525937, B29D 1100

Patent

active

046197931

ABSTRACT:
Optically clear soft contact lenses of aqueous swollen solid polyvinyl alcohol having a weight average molecular weight of at least 6,000, having been annealed under crystallinity promoting conditions to effectively increase the elastic modulus of the swollen lenses, and optionally subsequently crosslinked, and methods of preparation and the use thereof are disclosed. The lenses are characterized by their relatively high oxygen transmissibility, sufficient to meet the needs of the human cornea, high optical clarity, improved hot water resistance and superior mechanical properties.

REFERENCES:
patent: 3193542 (1965-07-01), Imai
patent: 3232916 (1966-02-01), Fogle
patent: 3408429 (1968-10-01), Wichterle
patent: 3548031 (1970-12-01), Oyanogi
patent: 3679646 (1972-07-01), Bristol
patent: 4255475 (1981-03-01), DelGrande
patent: 4343787 (1982-08-01), Katz
Journal of Membrane Science, 9, (1981), 53-67.

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