Method for manufacturing thin progressive addition lenses

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

B - Operations, Transporting

29

D

B29D 11/00 (2006.01)

Patent

CA 2158840

A method for casting a progressive addition lens using a mold (8) with a spherical portion and an add zone includes placing a volume of resin into the cavity of the mold, placing a preformed lens (7) having a convex curvature correlated with the concave curvature of the mold into the mold so 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 (10) with respect to the geometrical center of the mold (9).

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