Method for manufacturing thin progressive addition lenses

Details Method for manufacturing thin progressive addition lenses Method for manufacturing thin progressive addition lenses

1993-03-24

1996-01-02

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 22, 425808, B29D 1100

Patent

active

054806003

ABSTRACT:
A method is provided for casting a progressive addition lens from: a mold incorporating a spherical portion and an add zone; a preformed lens having a convex curvature correlated with the concave curvature of the mold; and a polymerizable resin. The method includes the steps of: placing a predetermined volume of resin into a cavity of the mold; placing the preformed lens into the mold such that a layer of resin spreads out and covers any intervening space between the lens and the mold; and displacing superiorly or nasally by a predetermined magnitude the optical center of the preformed lens with respect to the geometrical center of the mold.

REFERENCES:
patent: 4190621 (1980-02-01), Greshes
patent: 4522768 (1985-06-01), Roscrow et al.
patent: 4615847 (1986-10-01), Howden
patent: 4693446 (1987-09-01), Orlosky
patent: 5147585 (1992-09-01), Blum

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