Polymeric bifocal lens production process

Details Polymeric bifocal lens production process Polymeric bifocal lens production process

1992-11-25

1994-11-22

Vargot, Mathieu

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 27, B29D 1100

Patent

active

053666682

ABSTRACT:
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; toughening 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.

REFERENCES:
patent: 2339433 (1944-01-01), Staehle
patent: 3248460 (1966-04-01), Naujokas
patent: 3763290 (1973-10-01), Sheld
patent: 4190621 (1980-02-01), Greshes
patent: 4279401 (1981-07-01), Ramirez et al.
patent: 4432832 (1984-02-01), Fantone
patent: 4623496 (1986-11-01), Verhoeven et al.
patent: 4957663 (1990-09-01), Zwiers et al.

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