Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Nonmechanical aftertreatment
Patent
1984-11-26
1986-01-14
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Nonmechanical aftertreatment
264 21, 264 27, 351161, B29D 1100
Patent
active
045644845
ABSTRACT:
A method of making a contact lens which reduces the spherical aberration of the eye by molding a contact lens blank with a concave aspheric surface having a longer radius of curvature at the center and a shorter radius of curvature toward the edge. A spherical convex surface is cut and polished on the aspheric xerogel lens blank. The xerogel lens is then hydrated to provide a soft hydrogel contact lens having a spherical convex surface and an aspheric concave surface, the lens is placed on the cornea of the eye and the concave lens surface assumes the curvature of the cornea. The convex lens surface becomes aspheric having a longer radius of curvature toward the edge and reduces the physiological spherical aberration of the eye.
REFERENCES:
patent: 4188353 (1980-02-01), Neefe
patent: 4239353 (1980-12-01), Koller
patent: 4307046 (1981-12-01), Neefe
Naturalens Fitting Manual, Isen, Griffin Contact Lens Laboratories, Toronto, 1971, pp. 1-16.
"Considerations on Adherence and Centralization of the Hydrogel Contact Lens, Contacto, Kikkawa, Mar. 1977, pp. 4-6.
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