Patent attributes
A progressive power lens in which distortion aberration is restricted and a manufacturing method therefore are provided. In a progressive power lens in which a progressive refracting surface provided with a first region arranged at an upper part of the lens for viewing relatively far, a second region arranged lower than the first region and having a larger refracting power than that of the first region, and a progressive zone arranged between these regions, whose refracting power is progressively changing, is formed on an inner surface of the lens, when both the far-sighted diopter and the near-sighted diopter are negative, as an upper practical region is separated from a virtual horizontal line passing through the geometric center of the lens, the curvature of the curve of the outer surface of the lens is gradually increased, while as the lower practical region is separated from the horizontal line, the curvature of the curve of the outer surface of the lens is gradually decreased.
