Patent ID: 7914145
Filing Date: 2011-03-29
Classification: G02C

Abstract:
1. 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, characterized in that an outer surface of the lens is made in a rotationally asymmetrical aspherical shape, wherein when a point on the lens outer surface at a distance of 15 mm upward of the lens along a tangent extending in the perpendicular direction at a far-sighted fitting point is set as A and a point on the lens outer surface at a distance of 15 mm downward of the lens as B, the average surface refracting powers P(A) and P(B) of the lens outer surface at the point A and the point B satisfy the following relation: a) when both the far-sighted diopter and the near-sighted diopter are negative: b) when both the far-sighted diopter and the near-sighted diopter are positive: