# Haploscope

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thumb | right | Synotophore by Walter Green with Sharp-Crawford rotating slide holdersA '''haploscope''' is an optical device for presenting one image to one [eye](/source/human_eye) and another image to the other eye. The word derives from two [Greek root](/source/Greek_root)s: ''haploieides'', single and ''skopeo'', to view. The word is often used interchangeably with [stereoscope](/source/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](/source/medicine) field than elsewhere, where it refers to instruments designed to test [binocular vision](/source/binocular_vision). These instruments include [Worth's amblyoscope](/source/Worth's_amblyoscope) and the [synoptophore](/source/synoptophore).<ref>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]</ref>

Commonly haploscopes employ front-surfaced [mirror](/source/mirror)s 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&nbsp;feet), was constructed by [Vaegan](/source/Vaegan) in about 1975 to research [stereoacuity](/source/stereoacuity).<ref>{{cite thesis |last1=Vaegan |title=Sensory and motor fusion in binocular vision |publisher=Dissertation Abstracts International |date=1978}}</ref> The large images allowed very small [retinal disparities](/source/retinal_disparity) to be presented.

== See also ==
* [Cheiroscope](/source/Cheiroscope)
* [Diplopia](/source/Diplopia)
* [Amblyopia](/source/Amblyopia)
* [Orthoptist](/source/Orthoptist)

==References==
{{reflist}}

==External links==
* [http://www.internationalorthoptics.org/ International Orthoptics Association]
* [https://web.archive.org/web/20090615170658/http://orthoptics.org.au/OAA07/ Orthoptics Association of Australia]

Category:Optical devices

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