Methods for producing progressive addition lenses

Details Methods for producing progressive addition lenses Methods for producing progressive addition lenses

G - Physics

02

C

G02C 7/06 (2006.01) B29D 11/00 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2287059

A process for producing a progressive addition lens for a lens wearer. The process comprises the steps of providing an optical preform comprising at least one surface having a predetermined first cylinder axis, a predetermined cylinder power, and a predetermined first near vision zone position. A mold is provided for casting a surface onto the optical preform. The mold has a second near vision zone that is aligned with the lens wearer's near viewing pupil location. The preform is positioned in relation to the mold in order to provide the resulting lens with a cylinder axis desired for the lens wearer.

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