Method of making toric contact lenses

Details Method of making toric contact lenses Method of making toric contact lenses

1990-04-20

1991-11-19

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Rotational molding

264 14, 425808, B29D 1100

Patent

active

050664310

ABSTRACT:
The invention relates to a method of spin casting lenses having optical surfaces which may be spherical, aspherical or toric in shape. The method provides a concave optical mold having a spherical, aspherical or toric optical surface. A convex optical mold having a spherical, aspherical or toric surface is also privided. A selected liquid lens monomer with a selected catalyst is placed in the concave lens mold. The convex optical mold is positioned in the concave mold displacing the liquid lens monomer. The optical axis of the concave and convex molds are aligned and the two molds rotated about their concurrent optical axis. The liquid monomer is allowed to polymerize forming a solid polymer lens. The finished lens is then removed from the molds.

REFERENCES:
patent: 4022855 (1977-05-01), Hamblen
patent: 4422984 (1983-12-01), Nufe
patent: 4806287 (1989-02-01), Sule et al.

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