Patent ID: 6652097
Filing Date: 2003-11-25
Classification: G02C

Abstract:
A progressive-power spectacle lens having a front surface and a back surface, said lens including a distance portion having a dioptric power for distance vision, a near portion having a dioptric power for near vision, and an intermediate portion having a progressive dioptric power for a vision in a range intermediate between the distance portion and the near portion, at least one of said front and back surfaces being formed as a progressive-power surface whose dioptric power varies depending upon a position thereon, said spectacle lens having a prismatic effect including a prescribed prismatic effect and unprescribed prismatic effect, a shape of said progressive-power surface of said spectacle lens being different from a shape of a progressive-power surface of a reference lens that is defined as a lens which does not have the prescribed prismatic effect and is identical in a spherical power, an astigmatic power, a cylinder axis and an addition power to said spectacle lens, said progressive surface of said spectacle lens being configured to compensate for aberration that is caused if the prescribed prismatic effect is added in the reference lens.