Vision testing system for stereoscopic viewing by a test person
First Claim
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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Accused Products
Abstract
An image display system comprises polarization spectacles having different polarization axes with or without λ/4-foils of both polarization lenses forward of the eyes of the person to be tested. The system of the invention further includes an image display device for generating light with a specific direction of polarization or a specific rotational direction of the circularly polarized light. The image display device comprises essentially at least one vectograph film and at least one image screen. This arrangement can so influence the light coming from the image screen that test figures or parts thereof can be seen by only one eye or by both eyes. If the image display system is to be used as a vision testing system and the test figures are to be changed, then there is a corresponding command of a drive circuit via a memory. The drive circuit drives the image screen in a suitable manner. A color display can be provided by making an appropriate modification to the image display device.
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Citations
14 Claims
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1. A vision testing system for stereoscopic viewing by a test person, the system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A vision testing system for stereoscopic viewing by a test person, the system comprising:
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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; 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; said image display having a rearward side; at least one light source mounted at said rearward side for emitting light transilluminating said image display; color changing means for changing the color of said light emitted by said light source; and
,a switching device connecting said input means to said color changing means for actuating said color changing means to change the color of the light emitted by said light source.
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Specification