Any one can help when I do edging high prescription lenses like -8.00 and up when I check lenses after edging in the lens meter I am getting the lenses either off axis or slip so the PD will be off or even more than that the segment height changed although I am using anti-slippage stickers applied to the front and back of lenses .Any solution to this urgent problem. Urgently I need help with Edging High prescription lenses. I appreciate any suggestions.