Method of molding bifocal contact lenses

Details Method of molding bifocal contact lenses Method of molding bifocal contact lenses

1985-08-27

1987-04-21

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Including step of mold making

264 26, 264 27, 425808, B29D 1100

Patent

active

046595244

ABSTRACT:
A reproducible soft bifocal contact lens having a crescent shaped segment made by cast molding. A convex metal mold having the required two optical radii and prism is made from steel or brass. A negative replica of the convex metal mold is made from a heated and softened resinous material. The resinous concave negative mirror image made by compression or injection molding. The concave resinous mold is placed in a rubber sleeve and the liquid lens monomer is cast in the concave mold and allowed to polymerize. A concave optical surface is cut and polished on the solid lens material. The finished hard xerogel lens is removed from the concave resinous mold and hydrated to form the soft hydrogel bifocal lens.

REFERENCES:
patent: 4247492 (1981-01-01), Neefe
patent: 4279401 (1981-07-01), Ramirez

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