Designing and manufacturing methods of spectacle lens, and spectacle lens series

A manufacturing method of a spectacle lens having at least one of front and back surfaces that is aspherical, comprising:

• dividing the entire range of available vertex power of a spectable lens into a plurality of sections;
• preparing at least one type of semifinished lens blank for each of said sections, said semifinished lens blank having a front surface that is finished and a back surface that is unfinished;
• selecting one type of said semifinished lens blank according to a required specification for the spectacle lens;
• processing the unfinished back surface of the selected semifinished lens blank into an asperical surface to form a finished lens according to the required specification for the spectacle lens.

A spectacle lens series comprising:

• a plurality of types of spectacle lenses that are different in vertex power,
• wherein one of front and back surfaces of each spectacle lens is predetermined for each of a plurality of sections into which the entire range of available vertex power is divided, and the other of said front and back surfaces is an aspherical surface determined for a required specification, and
• wherein said spectacle lenses that have different vertex powers within the same section satisfy the following condition (1) for at least one height h within the range of 0<h<15:
• ΔD1m(h)i+ΔD2m(h)i≠ΔD1m(h)j+ΔD2m(h)j (1)
• where
• D1m(h) and D2m(h) are surface powers of the front and back surfaces (unit:
• diopter) at the point whose distance from the optical axis of said spectacle lens is h (unit:
• mm) in a plane that contains said optical axis,
• ΔD1m(h) is a variation of surface power of the front surface and is obtained by D1m(h)−D1m(0),
• ΔD2m(h) is a variation of surface power of the back surface and is obtained by D2m(h)−D2m(0), and
• the subscripts “i” and “j” represent the values of the spectacle lenses that have different vertex powers within the same section.