Method for minimising the weight of spectacle lenses

摘要

Spectacle lenses, such as for example toric plus lenses (positive, divergent lenses) or continuous vision lenses are to be produced in such a manner that a maximum possible reduction in weight is achieved for the spectacle lenses. To produce the spectacle lens, the precise form of the spectacle frame as well as the viewing point and the clamping point relative to a coordinate system are determined for the spectacle lens. The cross-section of the spectacle lens is then calculated in n-sections with respect to the coordinate system, this calculation being repeated until an optimized spectacle lens with minimum central thickness is calculated in conjunction with a minimum edge thickness predetermined by the spectacle frame. After the raw glass (blank) has been aligned and blocked, the spectacle lens is then milled, grinded and polished according to the previously determined optical values. <IMAGE>