Patent ID: 7507358
Filing Date: 2009-03-24
Classification: B29C,B29D,B29L,G02C

Abstract:
1. A method of making a series of steeply curved ophthalmic lens elements over a wide range of prescriptions using lens blanks having the same steeply curved front surface, wherein each ophthalmic lens element is adapted for mounting in eyewear, the ophthalmic lens elements having a non-zero prescription through power, the method comprising the steps of: (i) molding lens blanks each having a single radius of curvature along a principle meridian of less than 35 mm over a substantial portion of a front surface thereof; (ii) cutting a back surface on the molded lens blanks, which, together with the front surface, provide the non-zero prescription through power; (iii) edging the lens blanks to provide the steeply curved ophthalmic lens elements having a maximum hollow depth of at least 8 mm; and (iv) repeating steps (i), (ii), and (iii), as required, to obtain the series of steeply curved ophthalmic lens elements over a wide range of prescriptions using lens blanks having the same steeply curved front surface.