Patent ID: 7125118
Filing Date: 2006-10-24
Classification: G02C

Abstract:
1. A progressive multifocal lens for correcting eyesight comprising: a progressive refracting interface, said progressive refracting interface is located on a side of an eyeball or on a side of an object, wherein the progressive refracting interface comprises: wherein the eyeball-side refracting interface or the object-side refracting interface is a combined refracting interface comprising an original progressive refracting interface set only to exhibit a desired eyesight corrective characteristic and an original toric surface set only to exhibit a desired astigmatism corrective characteristic, wherein, when z-axis is an axis passing through the center of the progressive refracting interface from the object toward the eyeball, x-axis is cylinder axis of the original toric surface, and y-axis is an axis perpendicular to the x-axis and the z-axis, value z wherein the first expression (1) is expressed as  and wherein the second expression (2) is expressed as