Patent ID: 8960900
Filing Date: 2015-02-24
Classification: G02C

Abstract:
1. A progressive-power lens comprising: an object-side surface; and an eyeball-side surface, wherein one surface of the object-side surface and the eyeball-side surface includes wherein the one surface satisfies the following expressions (1) to (3) where n denotes a refractive index of the progressive-power lens, Add denotes a prescription addition power of the progressive-power lens, CT(DP) denotes a vertical direction curvature at the distance reference point, CT(NP) denotes a vertical direction curvature at the near reference point, CY(DP) denotes a horizontal direction curvature at the distance reference point, CY(P) denotes a horizontal direction curvature at a point on the principal meridian which is located further towards the near portion than the progressive start point, and CT(P) denotes a vertical direction curvature at the point on the principal meridian which is located further towards the near portion than the progressive start point.