Patents Assigned to Kazuo Ichikawa
  • Patent number: 9596985
    Abstract: [Problem] To be able to accurately measure color vision and color-viewing field for different colors. [Solution] The color-viewing function measuring means (1) pertaining to the present invention displays a plurality of chromatically colored targets (A11, . . . ) (for example, Landolt rings) in an achromatic background (B), the brightness of the targets (A11, . . . ) being set so as to be substantially equal to the brightness of the background (B). When vision or the viewing field is measured with this color-viewing function measuring means (1), vision and viewing field can be accurately measured for different colors.
    Type: Grant
    Filed: April 17, 2013
    Date of Patent: March 21, 2017
    Assignees: Kazuo Ichikawa, Shinshu University, Kowa Company, Ltd
    Inventors: Kazuo Ichikawa, Kiyoshi Tanaka, Tanaka Yoshiki