PROGRESSIVE SPECTACLE LENS WITH TWO NON-SPHERICAL SURFACES, MORE PARTICULARLY PROGRESSIVE SURFACES, AND METHOD OF CALCULATING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a progressive spectacle lens having two aspherical surfaces, particularly progressive surfaces, which contribute to the enhancement of effectiveness Add. (addition "Add.") from a far-vision part to a near-vision part. SOLUTION: A height zi=zi(x, y) in a meniscus lens, in at least one progressive surface (i) out of progressive surfaces (i=1, 2) is selected, in such a way that the height z of the meniscus lens of each surface has a predetermined value 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 opposite to the curvature forming a supporting edge, and the like. COPYRIGHT: (C)2011,JPO&INPIT