Method for designing a group of lenses grade progressive type Bi aspheres, and group of lenses of degree progressive type Bi aspheres

摘要

Method for designing a group of lenses grade progressive type Bi aspheres, and group of lenses of degree progressive type Bi aspheres. It is provided a group of lenses grade progressive type Bi aspheres, for which the costs of processing are reduced.In a lens (s) grade progressive Bi aspherical type are satisfied the relations DHF + DHN DVF + DVN and DHN DVN or, additionally, DVN - DVF Add / 2 and DHN - DHF add / 2; DHF and DVF are designated respectively as a degree of refraction of the surface in a horizontal direction. A degree of refraction of the surface in a horizontal direction, and a degree of refraction of the surface.In a vertical direction in a position for measuring the degree for distant vision, F1, the first refractive surface, which acts as a lateral surface of the object; and DVN DHN are designated respectively as a degree of refraction of the surface in a horizontal direction. A degree of refraction of superu00edcie, in a vertical direction in a position for measuring the degree for near vision N1.The first refractive surface; a component of astigmatism of the surface in F1 and N1 of the first refractive surface is cancelled by a second refractive surface of the eye surface; and the first and the second refractive surfaces are combined to provide a degree of Distant vision (DF) and an additional (add)On the basis of a recipe; where the same first refractive surface is used for at least two or more types of further degree different.