Patents Assigned to Iris Optics Ltd.
  • Reading spectacles
    Patent number: 4898459
    Abstract: Reading spectacles are tested for acceptability by a user by providing each lens with a releasable opaque film having a small circular window aligned with the optical centre of the lens. Acceptable spectacles are determined by the optical centers of the lenses being sufficiently aligned with the optical centers of the eyes to permit reading through the restricted field of view afforded by the windows.
    Type: Grant
    Filed: October 1, 1987
    Date of Patent: February 6, 1990
    Assignee: Iris Optics Ltd.
    Inventor: Carl E. Eriksson