Title:
【発明の名称】レンズ
Document Type and Number:
Japanese Patent JP2914691
Kind Code:
B2
Abstract:
An artificial eye lens such as a contact lens (2) or intra-ocular lens corrects astigmatism by two sets of substantially linear parallel zones (A1-A6, B1-B6) arranged to diffract light predominantly into one order at one orientation, the spacing of the zones diminishing on either side of the linear axis III-III min . In addition circular diffraction zones may be provided to give both spherical and cylindrical power for astigmatism correction.
Inventors:
MAIKERU HARORUDO FURIIMAN
Application Number:
JP33093289A
Publication Date:
July 05, 1999
Filing Date:
December 20, 1989
Export Citation:
Assignee:
PIRUKINTON BAANZU HAINDO INC
International Classes:
A61F2/16; G02B5/18; G02C7/04; G02C7/02; G02C7/06; (IPC1-7): G02C7/02; A61F2/16; G02C7/06
Attorney, Agent or Firm:
Yoshiyuki Inaba (2 outside)