Method of making a soft ophthalmic lens

Details Method of making a soft ophthalmic lens Method of making a soft ophthalmic lens

1992-12-15

1995-03-07

Vargot, Mathieu

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Including step of mold making

264 22, B29D 1100

Patent

active

053955587

ABSTRACT:
A method for molding a soft ophthalmic lens mates a male and a female portion, one having around the periphery of the optical surface a knife edge and one containing a rim bushing peripherally exterior to the knife edge so that the knife edge deformably penetrates the other portion. Excess material is expelled from the mold cavity and separated from the lens by a region of prepolymer discontinuity defined by the rim bushing is produced by using a cylindrical insert and an annular sleeve machined to have the rim bushing on the surface of one end.

REFERENCES:
patent: 4121896 (1978-10-01), Shepherd
patent: 4211384 (1980-07-01), Bourset et al.
patent: 4284399 (1981-08-01), Newcomb et al.
patent: 4640489 (1987-02-01), Larsen
patent: 4681295 (1987-07-01), Haardt et al.
patent: 4865779 (1989-09-01), Ihn et al.
patent: 5036971 (1991-08-01), Seden et al.

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