Progressive-power lens and progressive-power lens design method

摘要

A progressive-power lens having an eyeball-side surface including a distance portion and a near portion having different values of dioptric power and an intermediate portion that connects the distance portion and the near portion to each other, and an object-side surface including a spherical first region having first curvature and extending along a principal meridian, a spherical second region having second curvature equal to the first curvature and facing the distance portion, and a third region located outside the first region and below the second region and having third curvature smaller than the first curvature.