Method of designing both-plane aspherical progressive refractive power lens group and both-plane aspherical progressive refractive power lens group

摘要

A both-plane aspherical progressive refractive power lens group reduced inprocessing costs. The same first refractive surface is employed for at leasttwo kinds of different additional powers in a both-plane aspherical progressiverefractive power lens, where, when a lateral surface refractive power and a longitudinalsurface refractive power at a distance power measuring point F1 on the first refractivesurface as an object-side surface are respectively DHf and DVf and a lateral surfacerefractive power and a longitudinal surface refractive power at a reading powermeasuring point N1 on this first refractive surface are respectively DHn andDVn, the relational expressions DHf + DHn DVf + DVn and DHn DVn are satisfied,or the relational expressions DVn - DVf ADD/2 and DHn - DHf ADD/2 are furthersatisfied and at the same time surface astigmatic components at F1 and N1 on thefirst refractive surface are offset on a second refractive surface as an eyeball-sidesurface to give a distance power (Df) and an additional power (ADD) based on a prescriptionvalue in combination of the first and the second refractive surfaces.