The ability to see the 3D visual world with two eyes is called stereopsis. Some people have a deficit in this ability. If I show a stereogram in a classroom, several students appear not to perceive a figure defined by binocular disparity. I want to know how prevalent stereoblindness is among adults. I would appreciate if someone could point me towards a reference on statistical data on the fraction of stereoblind people.
As you correctly stated that " The ability to see the visual world with two eyes is called stereopsis". Following this explanation we can conclude that each person who has a low vision or no vision in one eye is as you named stereoblind.
The causes of low vision or vision loss in one eye are very different, starting from congenital abnormalities - strabismus ( misaligment of the eyes), congenital disease in one eye, or aquired eye diseases, outcome of trauma, etc. I think that cummulative statistical data on stereoblind people does not exist., but I can recommend to look the site VISION 2020 or findings by World Health Organisation. I hope that these sites will be helpful in this matter.
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Good luck,
Prof. M. Shahsuvaryan
look at these publications:
http://www.iovs.org/content/38/3/557.full.pdf
http://bjo.bmj.com/content/85/5/619.full.pdf
http://www.cmb.ac.lk/administration/acpb/files/2012/11/Changing_pattern_of.PDF
Dear Marianne and Samuel, thank you for your advice on VERY interesting references! These references widen my scope on binocular stereopsis. Best regards, Ichiro
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