Patent ID: 7241010
Filing Date: 2007-07-10
Classification: G02C

Abstract:
1. A manufacturing method of a bi-aspherical type progressive-power lens, wherein a first refractive surface as an object side surface, and a second refractive surface as an eyeball side surface have progressive refractive power action, and surface astigmatism components on the first refractive surface are cancelled by the second refractive surface, so that the first and second refractive surfaces together provide a far vision diopter (Df) and an addition diopter (ADD) based on prescription values, the method comprising: previously preparing a semi-complete product having the first refractive surface already processed, which is bilaterally symmetrical with respect to one meridian passing through a far vision diopter measurement position F after order reception, drawing the one meridian passing through a far vision diopter measurement position F processing the second refractive surface.