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- FOCOVISION SR-3 The Focovision by Reflection SR-3 is used in the production of semi-finished lenses, glass and metal molds, but also in prescription laboratories to control the incoming semi-finished lenses. It measures the surface optical power by reflection on one point with a high degree of accuracy. The measured value can be expressed in curvature or in diopter. The Focovision by Reflection has become a worldwide reference instrument throughout the ophthalmic industry.