PROGRESSIVE SPECTACLE LENS WITH TWO NON-SPHERICAL SURFACES, MORE PARTICULARLY TWO PROGRESSIVE SURFACES

摘要

The invention relates to a progressive spectacle lens comprising two non-spherical surfaces, more particularly two progressive surfaces, which contribute to the enhancement of the effectiveness (addition add) of the long distance vision part to the reading distance part. The invention is characterized in that the sagittas zi = zi (x, y) of at least one (i) progressive surface (i=1,2) are selected in such a way that the sagittas (z) of the respective surface have predetermined values in the edge of the glass spectacles defined by yi = fi1 (x) for y = 0 or. Yi = fi2 (x) for y 0 without this surface (i) or the other surface (j) having a curvature inversion serving to form a margin, etc.