Progressive power lens

摘要

A progressive power lens belonging to a series of lenses according to the present invention is provided. If a first lens and a second lens randomly chosen from the series of progressive power lenses have a common spherical refractive power Sph [diopter] in the distance portions thereof, the Sph is greater than or equal to +1, and a base curve BC1 of the first lens is smaller than a base curve BC2 of the second lens, the first and second lenses satisfy a condition: 1 $\begin{array}{c}\frac{\mathrm{Wds}\left({\mathrm{BC}}_1,\mathrm{Sph}\right)}{\frac{\mathrm{Wns}\left({\mathrm{BC}}_1,\mathrm{Sph}\right)}{\frac{\mathrm{Wdt}\left({\mathrm{BC}}_1,\mathrm{Sph}\right)}{\mathrm{Wnt}\left({\mathrm{BC}}_1,\mathrm{Sph}\right)}}}<\frac{\mathrm{Wds}\left({\mathrm{BC}}_2,\mathrm{Sph}\right)}{\frac{\mathrm{Wns}\left({\mathrm{BC}}_2,\mathrm{Sph}\right)}{\frac{\mathrm{Wdt}\left({\mathrm{BC}}_2,\mathrm{Sph}\right)}{\mathrm{Wnt}(}}}\end{array}$