Method of making bifocal lens blanks

Details Method of making bifocal lens blanks Method of making bifocal lens blanks

1984-06-08

1985-06-18

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 27, B29D 1100

Patent

active

045240353

ABSTRACT:
A method of making bifocal resinous lenses by providing a positioning cylinder connected to a low refractive index polymer. Cutting a convex optical surface orientated to the positioning cylinder. A high index polymer is cast on the low index optical surface and a second shorter radius convex optical surface which intersects both the high and low refractive index materials is cut and polished. Additional low index polymer is cast over the second shorter radius surface and polymerized. A bifocal lens blank is cut from the polymer mass having the high refractive index surfaces orientated to the exterior blank surfaces.

REFERENCES:
patent: 3270099 (1966-08-01), Camp
patent: 3431327 (1969-03-01), Tsuetaki
patent: 3440306 (1969-04-01), Neefe
patent: 3560598 (1971-02-01), Neefe
patent: 3662040 (1972-05-01), Urbach et al.
patent: 3773868 (1973-11-01), Bronstein
patent: 3984506 (1976-10-01), Tsuetaki

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