Contact lens and method of making same

Details Contact lens and method of making same Contact lens and method of making same

1989-09-05

1990-07-03

LaRoche, Eugene R.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351168, 51284R, G02C 704, G02C 706, B24B 100

Patent

active

049385836

ABSTRACT:
A bifocal contact lens is made by cutting a first convex surface on the anterior surface of the lens, the first convex surface being a near distance corrective surface and the posterior surface being shaped to the eye, so that substantially the entirety of the anterior surface is formed by the first corrective surface. A second corrective surface is cut after the lens is eccentrically offset from the axis of rotation of the first surface, the second surface being of greater radius then that of the first surface and the two corrective surfaces forming substantially the entirety of the anterior surface of the lens with the lens being devoid of ballasting other than that provided by the eccentric thinning of the lens.

REFERENCES:
patent: 1473360 (1923-11-01), Styll
patent: 2112836 (1938-04-01), Evans
patent: 3279878 (1966-10-01), Long
patent: 3913274 (1975-10-01), Raiford et al.
patent: 4202848 (1980-05-01), Neefe
patent: 4324461 (1982-04-01), Salvatori
patent: 4618229 (1986-10-01), Sacobstein et al.

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