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Vision testing system for stereoscopic viewing by a test person

  • US 5,638,082 A
  • Filed: 10/25/1993
  • Issued: 06/10/1997
  • Est. Priority Date: 10/23/1992
  • Status: Expired due to Term
First Claim
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1. A vision testing system for stereoscopic viewing by a test person, the system comprising:

  • an image display emitting polarized light and having a plurality of image display elements for displaying respective images and said image display elements being arranged in said image display to have a fixed geometrical arrangement to each other;

    a vectograph film disposed forward of said image display and having a plurality of polarization elements with each of said polarization elements completely covering at least one of said image display areas;

    said polarization elements being arranged on said vectograph film in strip or checkerboard pattern;

    each of said polarization elements defining a polarization axis and the respective polarization axes of each two mutually adjacent ones of said polarization elements being mutually perpendicular;

    polarization spectacles with which the test person can view the image display through said vectograph film;

    said polarization spectacles having two filter discs having respective polarization foils;

    said polarization foils having respective polarization axes which are mutually perpendicular and one of said polarization axes of said polarization foils extending in the same direction as the polarization axes of a first portion of said polarization elements being assigned to one eye of the test person and the other one of said polarization axes of said polarization foils extending in the same direction as the polarization axes of a second portion of said polarization elements and being assigned to the other eye of the test person;

    input means for effecting changes on said image display;

    a drive circuit connected to said image display for individually driving each of said image display elements so as to permit separate test images to be formed for each eye of the test person;

    a nonvolatile permanent memory for permanently storing a plurality of different ones of said test images to be displayed on said image display;

    said nonvolatile permanent memory being addressable by said input means to transmit selected signals indicative of selected ones of said images to be displayed; and

    ,said nonvolatile permanent memory being connected to said drive circuit for transmitting said selected signals to said image display elements for changing said images on said image display to said selected ones of said images.

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