Method for designing spectacle lens, method for manufacturing spectacle lens, and system for designing spectacle lens

A system for manufacturing a spectacle lens, wherein

• an index that is obtained by quantifying rotational asymmetry regarding the aberration distribution of an eye of a wearer about an optical axis is represented by Ei,
• a standard value of Ei is represented by Es, and
• an index that is obtained by quantifying rotational asymmetry of an aberration distribution in a region (i) having a predetermined width and (ii) a center at any point on a main meridian of a spectacle lens is represented by Li,
• the system comprising:
• a computer configured to:
• obtain, as a design solution, a spectacle lens of which Li is a first amount when Ei is larger than Es;
• and
• obtain, as a design solution, a spectacle lens of which Li is a second amount when Ei is not larger than Es, the first amount being lower than the second amount, wherein
• the system is configured to manufacture a spectacle lens having an aberration distribution of which rotational asymmetry is the first amount or the second amount.