| 摘要 |
A progressive spectacle lens having two aspherical and in particular progressive surfaces, i.e. surfaces contributing to the rise in the effect (addition Add.) from the distance vision portion to the near vision portion, in which the sagittal heights <?in-line-formulae description="In-line Formulae" end="lead"?>z<SUB>i</SUB>=z<SUB>i</SUB>(x,y)<?in-line-formulae description="In-line Formulae" end="tail"?> of at least one (i) progressive surface (i=1,2) are chosen such that the sagittal height z of this respective surface at the edge of the spectacle lens given by <?in-line-formulae description="In-line Formulae" end="lead"?>y<SUB>i</SUB>=f<SUB>i1</SUB>(x) for y>=0 and<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>y<SUB>i</SUB>=f<SUB>i2</SUB>(x) for y<0<?in-line-formulae description="In-line Formulae" end="tail"?> assume predefined values without this surface (i) or the other surface (j) having a reversal of curvature forming a supporting edge.
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