Patent ID: 8042942

Claim:
A progressive-power lens comprising: an object-side refractive surface; and an eye-side refractive surface, the eye-side refractive surface including: a distance portion having power to view relatively distant objects; a near portion having power to view relatively near objects, and an intermediate portion having power to continuously view intermediate objects between the distant and near objects, wherein the eye-side refractive surface of the distance portion is concave, wherein at least part of the eye-side refractive surface of the near portion is a convex region, wherein the progressive-power lens is configured to provide multiple viewing zones at a time in a single lens, wherein the distance portion is configured to have a prescribed positive power, and wherein the ratio of the surface area of the convex region within a circle having a radius of 25 mm from the geometrical center of the progressive-power lens to the surface area of the circle is less than or equal to 30%.