Patent ID: 10928655

Abstract:
A series of spectacle lenses is disclosed, wherein each lens has a spherical front surface and an aspheric, atoric, or freeform back surface. Further, each lens of the series provides a focal power Px between −6 D and +4 D; and at least one lens of the series provides a focal power Px between at least one of (a) −0.75 D and +2.25 D and (b) −0.5 D and +2.00 D. For an upper range of focal powers, lenses having the same nominal front surface power are provided; and for a lower range of trough powers, lenses having the same minimum nominal back surface power are provided. The spherical front surface has a nominal front surface power Pf and the back surface has a minimum nominal back surface power Pb; wherein 15.5 D≤|Pf|+|Pb|+|Px|≤31.5 D applies for each spectacle lens of the series.