Patent ID: 6736505
Filing Date: 2004-05-18
Classification: G02C

Abstract:
A progressive power spectacle lens having a progressive power surface on at least one of a front surface and a back surface of the spectacle lens, the progressive power surface including a distance portion corresponding to a long-distance view, a near portion corresponding to a short-distance view and an intermediate portion between the distance portion and the near portion, a refracting power gradually changes in the intermediate portion between the distance portion and the near portion,wherein a shape of the progressive power surface along a main meridian is not umbilical, and wherein the distance portion includes an area where quantity of surface astigmatism decreases from a position on the main meridian to a predetermined position farther from the main meridian in the horizontal direction, the surface astigmatism then increasing at positions farther, in the horizontal direction, from the predetermined position.