Patent ID: 6935924

Claim:
A method for determining a bevel curve in a lens; wherein the lens is an EX lens, comprising the steps of: inputting a value of a curve of a concave face of the EX lens; and calculating a value of the bevel curve based on the inputted value of the curve of the concave face of the EX lens, wherein the value of the bevel curve is calculated as follows; when the EX lens is a plus-power lens, then K 1 =(an average value of the curve at the concave face)×(adjusting coefficient e + ); when the EX lens is a minus-power lens, then K 1 =(an average value of the curve at the concave face)×(adjusting coefficient e − ), wherein K 1 represents the value of the bevel curve, e + represents a number of 1 or greater, and e − represents a number of 1 or smaller.