Method of making hydrogel contact lenses having aspheric front s

Details Method of making hydrogel contact lenses having aspheric front s Method of making hydrogel contact lenses having aspheric front s

1987-08-17

1990-03-20

Arnold, Bruce Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160H, G02C 704

Patent

active

049096214

ABSTRACT:
A contact lens of soft, pliable opthalmic plastic material, said lens when in its dehydrated state having a spherical back surface which in its hydrated state conforms to the corneal curvature of the wearer's eye and, when in its dehydrated state, having an aspheric front surface which is a surface of revolution of polar coordinate form, having an asphericity which is a function of (n)[f]<sin(a)> where (a) is the polar angle, and (n) is a radial offset of a tool-controlling circular surface.

REFERENCES:
patent: 3142140 (1964-07-01), Ishida
patent: 3482906 (1969-12-01), Volk
patent: 3950082 (1976-04-01), Volk
patent: 4194815 (1980-03-01), Trombley
patent: 4195919 (1980-04-01), Shelton
patent: 4199231 (1980-04-01), Evans
patent: 4418991 (1983-12-01), Breger
patent: 4640595 (1987-02-01), Volk

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