Manufacturing method for spectacle lens and spectacle lens

A method of manufacturing a spectacle lens, specifically designing and manufacturing right and left spectacle lenses whereby a spectacle is constituted, having different prescriptions including dioptric power between right and left eyes, wherein when said difference of prescriptions including dioptric power is a prescribed value or more between the right and left eyes, said method comprises:

• selecting curvatures of first and second refracting surfaces of at least one of the right and left spectacle lenses based on a dominant eye ratio, so that a difference in curvature of the first refracting surface between the right and left spectacle lenses is within a prescribed range, after respective right and left spectacle lenses are made to fulfill the prescription conditions including dioptric power and the optical performance of the right and left spectacle lenses are within a permissible range, assuming that refracting surfaces on the front object side of right and left spectacle lenses are taken as a first refracting surface and the rear eyeball side thereof are taken as a second refracting surface, when the curvature of the first and second refracting surfaces of right and left spectacle lenses is designed, wherein
• the dominant eye ratio is the ratio of the optical performance index of the spectacle lens for the dominant eye side to that of the spectacle lens for the non-dominant eye out of the right and left eyes,
• the optical performance index is exponentiation of the distinct vision field spatial extent in the optical performance of respective spectacle lenses for the right and left eyes, expressed by index of I, (Di, Bi) wherein the power of the first refracting surface is Bi, measured in dopters, and the dioptric power of the prescription is Di, measured in diopters, therefore the optical performance index of the spectacle lens for the dominant eye is expressed by I (Dmj, B1) where the power of the first refracting surface of the lens for the dominant eye is B1 and the dioptric power of the prescription is Dmj, while the optical performance index of the spectacle lens for the non-dominant eye is expressed by I (Dmn, B2) where the power of the first refracting surface of the lens for the non-dominant eye is B2 and the dioptric power of the prescription is Dmn, and therefore, the aforementioned dominant eye ratio is expressed by I (Dmj, B1):I (Dmn, B2) which is the ratio of the optical performance indexes of the left and right spectacle lenses.