| 摘要 |
An apparatus and a method for accommodating for differential in an ophthalmic lens grinding operation utilizing bevel edger machines. Such machines typically include a lens former assembly which has a former member upon which a particular frame shaped template rides to form the proper shape of the lens. The method includes the steps of adapting the former lens assembly of the bevel edger machine, externally of the differential settings of the machine, to provide a first profile for increasing the differential profile of the former member for a first lens-like material and allowing for providing a second differential for the former member which provides a proper differential for a second lens blank material. This may be accomplished in providing an adapter which is interposed between the former wheel and the lens template or a stepped former member. This provides for a new differential external to the internal adjustments of the machine. Additionally, there is provided a method for dry forming a polycarbonate lens whereby polishing of the bevel edge of the lens polycarbonate is accomplished which includes the steps of first dry grinding the rough polycarbonate lens and thereafter dry bevel edging a first periphery on the lens and thereafter wet finishing the peripheral surface around the lens whereby a polished polycarbonate lens edge is the result.
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