Curved face shape evaluation method, eyeglass lens manufacturing method, and eyeglass lens

A method of evaluating a curved surface shape of an eyeglass lens, the eyeglass lens having a surface that has a plurality of defocus regions, the surface being at least one of an object-side surface of the eyeglass lens and an eyeball-side surface of the eyeglass lens, the method comprising:

• aquiring three-dimensional data that describes a shape of the surface of the eyeglass lens that has the plurality of defocus regions;
• classifying the three-dimensional data, using cluster analysis, into a plurality of data groups;
• performing curve fitting on each of the plurality of data groups to obtain curved surface shape data;
• combining the curved surface shape data and extracting reference shape data that approximates the shape of the surface of the eyeglass lens that has the plurality of defocus regions;
• and
• comparing the three-dimensional data and the reference shape data and obtaining degrees of deviation of the three-dimensional data from the reference shape data,
• wherein the plurality of data groups includes, for each of the plurality of defocus regions, a respective data group, and
• wherein the plurality of data groups also includes, for a base region of the surface of the eyeglass lens that has the plurality of defocus regions, a corresponding data group, the base region being a region in which the plurality of defocus regions are not formed.