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> The problem is that we don't actually see 3D, we basically see 2D twice. Most of us do. But people who only have sight in one eye have no difficulty perceivi

> The problem is that we don't actually see 3D, we basically see 2D twice. Most of us do. But people who only have sight in one eye have no difficulty perceiving three dimensions. And some fairly large percentage of people with binocular vision are stereoblind, typically without even realizing it. If anything, I'd say it's not that > We're aided in converting our 2x 2D sight into 3D mental models through the use of color and parallax. so much as that we're aided in converting our 2D sight into 3D mental models through the use of stuff like color and parallax through the use of stereopsis.

lostlogin 8y ago
As you mention, binocular vision is lacking in a surprising number of people and until recently this was thought to be uncorrectable if not treated while the child was still young. That turned out to be not entirely accurate. Those without binocular vision can have a fairly large range of non-specific symptoms and perception problems. There is an interesting discussion of the change in understanding in this link. http://www.strabismus.org/all_about_strabismus.html http://www.strabismus.org/all_about_strabismus.html