Method for producing cost-optimized spectacle lenses with especially advantageous properties for the user
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United States of America Patent
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Mar 25, 2014
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app pub date -
Sep 7, 2011
filing date -
Sep 8, 2010
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Abstract
A method for producing spectacle lenses from raw lenses prefabricated in a non-cutting manner uses raw lenses having a central geometric axis standing vertically on them. The lens comprises a convex front side that is formed in a rotationally symmetrical manner about the central axis and is not to be reworked and an opposing back side that is to be reworked with a CNC machine. The front- and back side have at least one optical focal point in common. In order to rework the back side a prescription surface is calculated on the basis of a prescription and of the geometry of the front side. This surface forms a prescription lens in common with the front side, the focal points of which lens correct the visual error of the prescription holder. A spectacle lens with an optical center is produced from the prescription lens for use in an eyeglass frame.
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