Blocking shim and method for prescription-laboratory...

Details Blocking shim and method for prescription-laboratory... Blocking shim and method for prescription-laboratory...

B - Operations, Transporting

24

B

269/11, 26/197

B24B 13/005 (2006.01) G02C 7/02 (2006.01) G02C 7/06 (2006.01)

Patent

CA 1325646

-12- BLOCKING SHIM AND METHOD FOR PRESCRIPTION-LABORATORY PROCESSING OF ASPHERIC PROGRESSIVE-ADDITION LENSES Abstract of the Invention: A thin sheet of flexible material shaped like an inverted "T", is applied to the aspheric distance portion of a progressive-addition ophthalmic lens, to provide stable three-point contact for blocking the lens prior to second-side surfacing in the prescription laboratory.

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