| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for selection of a spectacle lens, whereby an optimum spectacle lens can be selected at low cost according to an individual wearer. SOLUTION: A horizontal view field width Fw extending horizontally from a far-sight eye point is determined. An amount Indih of downward rotation of an eye ball is measured. On the basis of this amount Indih of downward rotation of the eye ball, the far-sight eye point height Fh, a progressive band length SPh, and a near-sight height Nh,ΔE is obtained from the following equation:ΔE=Indih-(Fh+SPh+Nh). On the basis of thisΔE, a lens shape height Bh, an upper frame height Oh, the far-sight point height Fh, the progressive band length SPh, the near-sight height Nh, and the lower frame height Uh,ΔBh is determined from the following equation:ΔBh=Bh-(Oh+Fh+SPh+Nh+ΔE+Uh). A single spectacle lens is selected from wide and narrow lenses in a far-sight area so as to satisfy the following conditions: the horizontal visual field width Fw has a decided value, 0 mm≤ΔE≤2 mm, and 0 mm <ΔBh. COPYRIGHT: (C)2011,JPO&INPIT |
