Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Eye exercising or training type
Patent
1980-07-31
1983-09-06
Corbin, John K.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Eye exercising or training type
351243, 351244, G03B 2100
Patent
active
044025807
ABSTRACT:
An optical testing and exercising device including a stereo film viewer having a pair of eyepieces and one or more lenses which can be interposed along the user's line of sight to change the apparent distance of an image. The viewer also includes a housing with a pair of juxtaposed eyepieces and an opening to receive a film having a series of frames bearing images to be viewed. A frame advancing mechanism advances successive frames of the film into the line of sight of the device for viewing by the user through the juxtaposed eyepieces. The frame advancing mechanism also changes one or more lenses mounted in the housing between the eyepieces and the film receiving opening into the viewer's line of sight. The interposed lenses can be utilized for various effects, such as to change the apparent distance of the image from the viewer, thus causing the eye muscles to be exercised. Various combinations of lenses and images can be used with the device to test for many types of vision functions such as suppression, accommodation, acuity, phoria, and color vision.
REFERENCES:
patent: 2089863 (1937-08-01), Updegrave
patent: 2213467 (1940-09-01), Greenspoon
patent: 3875934 (1975-04-01), Sadanaga
Bovernick Rodney B.
Corbin John K.
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