Stereo fly

In orthoptics, a stereo fly is a test image, especially suitable for preverbal children, for the detection of spatial vision . This test image is part of the so-called Titmus test , a test method with which spatial vision can be quantified and its quality measured. The test persons are shown an enlarged, diagonally disparate image of a fly using polarized glasses , which appears three-dimensional when recognized correctly .

The result can also be rated as positive if the test persons startle because the picture leaves a deceptively real impression, or if they try to touch the fly's wings. The depth resolution of your spatial vision (stereopsis) is then at least 3600 arc seconds . However , this does not yet provide evidence of normal retinal correspondence. Even with a positive result, squinting is in no way excluded.

See also

3D glasses , stereoscopy , visual perception , long stereo test

literature

• Herbert Kaufmann (Ed.): Strabismus. With the collaboration of Wilfried de Decker et al. Enke, Stuttgart 1986, ISBN 3-432-95391-7 .

This article is about a health issue. It is not used for self-diagnosis and does not replace a diagnosis by a doctor. Please note the information on health issues !