Oxygen permeable bifocal contact lenses and their manufacture

Details Oxygen permeable bifocal contact lenses and their manufacture Oxygen permeable bifocal contact lenses and their manufacture

1990-11-29

1992-12-08

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160R, 351177, G02C 704

Patent

active

051701928

ABSTRACT:
An oxygen permeable bifocal contact lens with a Dk of at least 10.times.10.sup.-11 in which a distance vision portion having a refractive index of not more than 1.49 is formed as a preform in which there is provided a recess, and a near distance vision portion having a refractive index of at least 1.540 is formed by filling the recess with a monomer mixture and polymerizing. It is preferred that the distance vision portion be formed as an interpenetrating network copolymer by partially polymerizing one monomer mixture to a predetermined relative viscosity and then adding a second monomer mixture and copolymerizing the resulting mixture. The near distance vision portion may also be formed as an interpenetrating network in the same manner.

REFERENCES:
patent: 3560598 (1971-02-01), Neefe
patent: 3597055 (1971-08-01), Neefe
patent: 3684357 (1972-08-01), Tsuetaki
patent: 3726587 (1973-04-01), Kendall
patent: 3984506 (1976-10-01), Tsuetaki
patent: 4302081 (1981-11-01), Tsuetski
patent: 4614624 (1986-09-01), Neefe
patent: 4921205 (1990-05-01), Drew, Jr. et al.

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