Patent ID: 7643899
Filing Date: 2010-01-05
Classification: B24B

Abstract:
1. A method of controlling an edger device for edging an ophthalmic lens blank, comprising the steps of: providing a lens blank having first and second opposite major surfaces, and a peripheral edge therebetween; providing an edger device having a cutting mechanism; providing a central processing unit operably associated with the edger device for controlling operation of the cutting mechanism; and transmitting processing instructions from the central processing unit to the edger device, wherein the processing instructions comprise: a) forming a bevel in a peripheral edge of a lens blank, the bevel having an apex extending outwardly from the peripheral edge; b) forming a step in the peripheral edge intermediate the apex and an interface between the peripheral edge and the second major surface, the step comprising a backwall and a base, wherein the backwall extends from the peripheral edge in a direction opposite the apex.