Ophthalmological instrument for producing dichoptic stimuli on a

Details Ophthalmological instrument for producing dichoptic stimuli on a Ophthalmological instrument for producing dichoptic stimuli on a

1993-03-22

1996-06-25

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For fusion and space perception testing

351222, 351232, 351240, 351243, 351246, 348 54, A61B 302, A61B 308, A61B 309, H04N 1304

Patent

active

055304923

ABSTRACT:
A method and system for presenting two successive images on a video display unit as a dichoptic stimulus of substantially equal intensity, wherein a first image is displayed at a predetermined intensity so as to be seen by a first eye of an observer only, an optical shutter being used to prevent the displayed image from reaching the second eye of the observer. The first image is then extinguished and the state of the optical shutter reversed so that the first eye can no longer see the video display unit whilst a second image is presented to the second eye. In order to prevent the second eye from seeing an after image of the first image, a neutral density filter or polarizer is disposed within the light path and the second image is illuminated at a correspondingly higher intensity so as to compensate for the attenuation factor of the neutral density filter or polarizer. Such a method may be employed to measure the dark vergence of the observer which has been found to be a major factor in determining fatigue of computer operators, in order that corrective action may be taken so that the angle subtended by an image on the computer screen at the eyes of the observer may be adjusted to the angle of dark vergence. Such corrective action may be provided by individually tailored prismatic spectacles.

REFERENCES:
patent: 2206303 (1940-07-01), Neumeueller et al.
patent: 4870486 (1989-09-01), Nakagawa et al.
patent: 5076665 (1991-12-01), Petersen
patent: 5143081 (1992-09-01), Young et al.
patent: 5204702 (1993-04-01), Shapiro

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