Patent ID: 7290878

Claim:
A device for testing binocular vision in humans comprising of: (a) an enclosure with right and left eyepieces and focusing lenses, (b) a front chamber and a rear chamber with each chamber having independent lighting, (c) a backdrop in said front chamber for mounting stereograms, fusible images, and non-fusible images that are viewable through the eyepieces, (d) a two-way mirror partitioning said front chamber from said rear chamber that separates said backdrop in said front chamber from a rival image pair consisting of a right rival image and a left rival image located in said rear chamber so that said rival image pair is illuminated primarily from light from said rear chamber and said rival image pair is visible through said evepieces only when the illumination is brighter in said rear chamber than in said front chamber, (e) means of providing sufficient energy to illuminate said front and rear chambers, (f) means of independently switching on and off the lighting of said front chamber and said rear chamber, whereby, images can be viewed by children and adults for measurement of binocularity, stereopsis, and binocular rivalry concurrently, or binocular rivalry can be measured separately from binocularity and stereopsis.