Patent ID: 11934042
Assignee: HOYA LENS THAILAND LTD.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC G

Claim 7:
8. An 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 eyeglass lens manufactured by a process comprising:
acquiring three-dimensional data that describes a shape of the surface of the eyeglass lens that has the 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;
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;
wherein the surface includes:
a base region, which is a region where the defocus regions are not formed; and
a boundary-vicinity region, which is a transition region between the defocus regions and the base region, and

wherein a magnitude of a degree of deviation of the boundary-vicinity region from a reference shape is not more than fifteen percent of a protrusion height or a recess depth of the defocus regions.