# Cheiroscope

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thumb|right|alt=A wooden cheiroscope|A wooden cheiroscope
A '''cheiroscope''' (also: ''chiroscope'') is an [optical device](/source/optical_device) consisting of a [viewing instrument](/source/viewing_instrument) equipped with a drawing pad, with the viewing instrument set up as a [haploscope](/source/haploscope) that blends a left and/or right image into view over the drawing.

The cheiroscope was presented in an article published in 1929.<ref name="maddox-1929">{{cite journal|author=E. E. Maddox|title=Demonstration of the Cheiroscope|journal=Proceedings of the Royal Society of Medicine|date=November 1929|volume=23|number=1|pages=48–55|pmc=2181531|pmid=19987221}}</ref> The author E. E. Maddox writes that compared to the earlier [amblyoscope](/source/amblyoscope),
:"[t]he cheiroscope approaches the problem from a different and complementary angle, on the simple principle of pressing the ''hand'' into service to educate the eye."<ref name="maddox-1929"/>

A cheiroscope can be operated in different manners. For example, using a cheiroscope, a line image can be presented to one [eye](/source/human_eye) and the image of a blank sheet to the other eye, and the subject is intended to make a drawing that reproduces the line image.

The cheiroscope is used for diagnostic purposes to test [binocular vision](/source/binocular_vision), to assess certain conditions of [strabism](/source/strabism) in particular related to binocular stability and alignment,<ref name="ScheimanWick2008-p201-203">{{cite book|author1=Mitchell Scheiman|author2=Bruce Wick|title=Clinical Management of Binocular Vision: Heterophoric, Accommodative, and Eye Movement Disorders|url=https://books.google.com/books?id=jGGROHBFYt8C&pg=PA201|accessdate=11 July 2013|year=2008|publisher=Lippincott Williams & Wilkins|isbn=978-0-7817-7784-1|pages=201–203}}</ref> [cyclotropia](/source/cyclotropia),<ref>[http://covdblog.wordpress.com/tag/cyclorotation/ Case report: double vision to monovision] (downloaded 11 July 2013)</ref> and the presence and extent of [suppression](/source/Suppression_(eye)).<ref name="ScheimanWick2008-p201-203"/> It can also be used in [vision therapy](/source/vision_therapy) to train [amblyopic](/source/amblyopia) subjects in desuppression and [eye–hand coordination](/source/eye%E2%80%93hand_coordination).<ref name="ScheimanWick2008-p201-203"/>

A [stereoscope](/source/stereoscope) can be modified to function as a cheiroscope.<ref>[http://medical-dictionary.thefreedictionary.com/cheiroscope Cheiroscope], medical-dictionary.thefreedictionary.com (downloaded 11 July 2013)</ref>

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

==References==
{{reflist}}

Category:Optical instruments
Category:Stereoscopy

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Adapted from the Wikipedia article [Cheiroscope](https://en.wikipedia.org/wiki/Cheiroscope) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Cheiroscope?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.