Patent ID: 7740519

Claim:
A method for processing a chamfering of an eyeglass lens, comprising the steps of: preparing an eyeglass lens having an anterior refracting surface and a posterior refracting surface; inputting a width of a chamfering and a range of the chamfering from a periphery of a lens shape of the eyeglass lens to form a groove in an edge surface of the eyeglass lens or a V-shaped portion on the edge surface and a front edge portion on the edge surface at one side of the groove or V-shaped portion disposed adjacent to the anterior refracting surface, and forming a back edge portion on the edge surface at a second side of the groove or V-shaped portion disposed adjacent to the posterior refracting surface; displaying a special chamfering positional mark showing a position of the lens shape, a chamfering positional mark showing a most thinning position of an edge thickness and a chamfering width, a sectional shape at the chamfering positional mark of the lens shape, an edge sectional shape at the special chamfering positional mark of the lens shape to carry out a simulation processing of the eyeglass lens based on input matters, and a state of a chamfering portion and a change in the state of the chamfering portion when the special chamfering positional mark is moved toward the chamfering positional mark in the simulation; and controlling the chamfering of the posterior refracting surface so that a width of the back edge portion in a thickness direction of the eyeglass lens is larger than a width of the front edge portion.