Polymeric bifocal lens production process

Details Polymeric bifocal lens production process Polymeric bifocal lens production process

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 35/02 (2006.01) B29C 37/00 (2006.01) B29C 70/78 (2006.01) G02C 7/06 (2006.01) B29C 71/02 (2006.01)

Patent

CA 2083903

A polymeric bifocal lens production process including the steps of selecting a single vision lens or lens blank with a convex surface, and a bifocal mould with a smaller radius of curvature; roughening the convex surface of the lens or lens blank; assembling the mould and lens or lens blank with catalysed monomer between the mould and the lens or lens blank; holding the lens or lens blank and the mould in position relative to one another so that the lens or lens blank contacts the mould; curing the monomer; removing the mould and post-curing to relieve stress in the bifocal lens and to allow the cured monomer to shrink in a controlled manner thereby causing a power decrease in the bifocal segment, whereby the cured monomer cast on to the lens or lens blank is of higher refractive index than the lens or lens blank.

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