Method of removing soft contact lenses from the mold

Details Method of removing soft contact lenses from the mold Method of removing soft contact lenses from the mold

1985-04-22

1986-07-01

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonmechanical aftertreatment

264 21, 264 27, B29D 1100

Patent

active

045979189

ABSTRACT:
A method of removing the hard xerogel spin cast lens from the concave spin cast mold by hydrating the lens in the mold. The water is removed from the concave lens surface by evaporation, the convex lens surface in contact with the lens mold retains its moisture. The drying lens having a longer convex surface and a shorter concave lens surface becomes more curved and moves away from the lens mold releasing the xerogel lens from the mold.

REFERENCES:
patent: 3361858 (1968-01-01), Wichterle
patent: 3499862 (1970-10-01), Wichterle
patent: 3822089 (1974-07-01), Wichterle
patent: 4042652 (1977-08-01), Feneberg
patent: 4347198 (1982-08-01), Ohkada et al.

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