SPECTACLE LENS, AND DESIGN METHOD, MANUFACTURING METHOD, AND DESIGN SYSTEM OF SPECTACLE LENS

摘要

PROBLEM TO BE SOLVED: To provide a spectacle lens which prevents concentration of aberrations on the nose side and is suitable to secure a near visual field while considering convergence and divergence of wearer's eyes.SOLUTION: A spectacle lens comprises: a hidden mark which defines a prescribed reference point on the lens; and a plurality of refractive portions which are arranged along a meridian traversing the lens longitudinally substantially via the prescribed reference point defined by the hidden mark and include a first refractive portion located below the prescribed reference point and having first refractive power, a second refractive portion located above the prescribed reference point and having second refractive power lower than the first refractive power, and an intermediate refractive portion having refractive power continuously decreased from the first refractive portion to the second refractive portion. An aberration distribution in the first refractive portion is substantially bilaterally symmetrical with respect to the meridian extending in a vertical direction in the first refractive portion, and an aberration distribution in the second refractive portion is bilaterally asymmetrical with respect to the meridian inclined outward to the ear side of a lens wearer in the second refractive portion.