Method for manufacturing thin progressive addition lenses
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United States of America Patent
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-
Jan 2, 1996
Grant Date -
N/A
app pub date -
Mar 24, 1993
filing date -
Mar 24, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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