Patent ID: 8641937

Claim:
A method of manufacturing an eyeglass lens comprising: manufacturing a lens casting mold by introducing a forming mold, with a forming surface having a curvature Distribution on which a glass material being formed is positioned, into a continuous heating furnace, and conducting a thermal treatment while conveying the forming mold in the furnace to form an upper surface of the glass material being formed by bringing a lower surface of the glass material being formed into tight contact with the forming surface, wherein the thermal treatment comprises: specifying an average curvature in a direction running from a geometric center toward a perimeter portion of the forming surface of the forming mold in two or more different directions before introduction to the furnace, wherein an integer n denotes each of the two or more different directions without overlap of the integer n; directly or indirectly measuring a temperature at two or more measurement points on the forming surface of the forming mold in one or two or more regions within the furnace and specifying as a maximum temperature direction a direction running from the geometric center of the forming surface toward a point among the two or more measurement points that measure the highest temperature; continuously or intermittently repeating approximately full circle rotations along the axis of an advancing direction of the forming mold during passage through the furnace; and conducting the rotations in the region in which the maximum temperature direction has been specified such that an angular rotation speed of the forming mold decreases as the average curvature in an n th direction passing through the maximum temperature direction increases; and manufacturing an eyeglass lens by cast polymerization with the lens casting mold that has been manufactured, or some part thereof, as a casting mold.