Vision testing system for testing the sight function of a patien

Details Vision testing system for testing the sight function of a patien Vision testing system for testing the sight function of a patien

1992-05-08

1994-07-19

Ben, Loha

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351201, 351240, 359464, 348 58, A61B 302, G02B 2702, H04N 1300

Patent

active

053313585

ABSTRACT:
A vision testing system includes polarization spectacles having different polarization axes with or without .lambda./4 filters for the two polarization lenses forward of the eye of the patient to be tested. This system also includes a vision testing apparatus for generating light having a specific polarization direction. The vision testing apparatus includes essentially two polarization filters and two LCD-displays which are mounted alternately one behind the other. This arrangement can so influence the light coming from the light source that test figures or portions of the test figures can be seen by one eye or by both eyes. If a test figure is to be changed, then a corresponding command is issued via a key pad to a switching unit which drives two drive circuits of the two LCD-displays in a desired manner. By making appropriate modifications of the vision testing apparatus, a patient can be tested as to color-vision acuity.

REFERENCES:
patent: 3191493 (1965-06-01), Mainardi et al.
patent: 4097130 (1978-06-01), Cole
patent: 4415243 (1983-11-01), Gottlob et al.
patent: 4792850 (1988-12-01), Lipton et al.
patent: 4870486 (1989-09-01), Nakagawa et al.
patent: 4877309 (1989-10-01), Takamatsu
patent: 5026151 (1991-06-01), Waltuck et al.
"Stereoscopic Display Techniques Improve 3-D Workstation Views" by D. Brokenshire et al, Computer Technology Review, vol. 8, No. 13, 1988.

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