A computer-implemented method for establishing the representation of the edge of a spectacle lens or of a left spectacle lens and a right spectacle lens for a spectacle wearer is disclosed. The method includes: providing image data relating to the spectacle wearer with a worn spectacle frame; calculating information data derived from the image data; calculating a deterministically optimizable cost function linking the information data with spectacle lens data, wherein the spectacle lens data describe the spatial extent of at least one spectacle lens held in the spectacle frame; and setting a curve of an edge of the spectacle lens or of the left spectacle lens and the right spectacle lens by optimizing the cost function.