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A haploscope is an optical device for presenting one image to one eye and another image to the other eye. The word derives from two Greek roots: haploieides, single and skopeo, to view; the word is often used interchangeably with stereoscope, but it is more general than that. A stereoscope is a type of haploscope, but not vice versa; the word has more currency in the medical field than elsewhere, where it refers to instruments designed to test binocular vision. These instruments include Worth's amblyoscope and the synoptophore.[1]

Commonly haploscopes employ front-surfaced mirrors placed at different angles close to the eyes to reflect the images into the eyes. Reputedly the largest haploscope, with images of over a meter (in fact, 4 feet) square and a viewing distance for each eye of nearly five meters (16 feet), was constructed by Vaegan in about 1975 to research stereoacuity;[2] the large images allowed very small retinal disparities to be presented.

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  1. ^ Georgievski Z, Kowal L. Evaluating torsion with the Torsionometer, synoptophore, double Maddox rod test and Maddox wing: a reliability study. Australian Orthoptic Journal 1996, 32: 9-12. [Abstract]
  2. ^ Vaegan (1978). Sensory and motor fusion in binocular vision (Thesis). Dissertation Abstracts International.

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