Patent ID: 6733701
Filing Date: 2004-05-11
Classification: B29C,B29D,B29L,Y10S

Abstract:
A method for making toric lenses, comprising the steps of:providing a casting cell that includes a front mold, a toric back mold, and a gasket; securing an annular carrier ring to said toric back mold; dimensioning said annular carrier ring to have a diameter greater than a diameter of said toric back mold so that an annular step is formed between a peripheral edge of said toric back mold and said annular carrier ring; providing said gasket with a radially-inwardly extending annular wall so that a first flat step is formed where a front edge of said annular wall meets said gasket at a right angle and so that a second flat step is formed where a rear edge of said annular wall meets said gasket at a right angle; adapting said first flat step to squarely abut and support a peripheral edge of said front mold when said casting cell is assembled; positioning said peripheral edge of said front mold in squarely abutting relation to said first flat step; positioning said annular carrier ring in squarely abutting relation to said second flat step; filling a cavity defined by a back surface of said front mold and a front surface of said toric back mold with a reactive resin; and curing said resin.