Patent ID: 8297752

Claim:
A spectacle lens selection method to select a single spectacle lens including a distance portion, a progressive corridor, and a reading portion from a plurality of target spectacle lens, the method comprising: determining a horizontal fixation field width Fw, the Fw extending from a distance eyepoint in a horizontal direction; measuring an eyeball infraduction value Indih, the Indih being a length from the distance eyepoint to a reading eyepoint; determining a ΔE from Equation (1) based on the Indih, a distance portion eyepoint height Fh from a boundary between the distance portion and the progressive corridor to the distance eyepoint, a progressive corridor length SPh, the SPh being a length from the boundary between the distance portion and the progressive corridor to a boundary between the progressive corridor and the reading portion, and a reading portion eyepoint height Nh from the boundary between the progressive corridor and the reading portion to an optical center of the reading portion; determining a th from Equation (2) based on the Fh, the SPh, and the Nh; determining an upper frame height Oh from the distance eyepoint to an upper end of a test spectacle lens from Equation (3) based on a lens portion height Bh of the test spectacle lens, the th, the ΔE, and a lower frame height Uh from a lower end of the test spectacle lens to the reading eyepoint, Δ E=Indih −( Fh+SPh+Nh ) (1) th=Fh+SPh+Nh (2) Oh=Bh −( th+ΔE+Uh ) (3); judging a target spectacle lens satisfied the Fw and conditions of 0 mm≦ΔE≦2 mm and 0 mm<Oh; and selecting a spectacle lens satisfied the Fw and the conditions.