Patents Assigned to Tokai Kogaku Kabushiki Kaisha
  • Patent number: 5777716
    Abstract: An ophthalmic lens includes a refractive surface partitioned into a first area, a second area located above the first area and a third area located below the first area. The first area includes a reading point providing a first refractive focal power on a meridional line. The second area provides a surface refractive focal power less than that of the reading point, and the third area provides a surface refractive focal power stronger than that of the reading point. The refractive focal power in the first area progressively changes between the second and third areas. The first area includes a quasi-clear vision area that has a maximum horizontal width in the proximity of the geometrical center of the lens and a clear vision area.
    Type: Grant
    Filed: August 22, 1995
    Date of Patent: July 7, 1998
    Assignee: Tokai Kogaku Kabushiki Kaisha
    Inventor: Hitoshi Miura