We have 2 eyes for getting a 3D sence. But this 3D sence is there even to blinds. HOW?

Question

3D sence is mainly because of our two eyes. They give us Stereoscopic effect. But This 3D sence is there in partial ( One eye Blind) and total blinds too. How this is possible?

Answer 1

Two ears.... acoustics. A blind or just blind-folded person can still sense depth and range from the sounds his two ears pick up. Try it, it's fun.

Answer 2

Partial blindness can still mimic the stereoscopic effect if the single eye is moved ( the background changes). Background is essential for full stereoscopic effect. Even if you have two eyes and there's no background, there will be no full stereoscopic effect. In the absence of background all we can have will be angles, no sense of size.

For the totally blind I don't think they can ever sense the 3D sensation of seeing as we sense it. Our senses are linearly independent. You cannot explain one in terms of the other. If they are, then in reality there would only be one sense. So the 3D sonar sense of the totally blind cannot be used to explain to him the 3D optical sense as we experience it.

Answer 3

Well, You have to remember that as one sense dies out the other senses become more finely attuned to the world around you. Sort of a compensation thing. Also, the sense of depth is not limited to our eyes. I mean close your eyes and stick out your hands. You know that the area you are in is deeper than your reach, unless you are touching something, then you know it is close to you. Now blind people have a much more attuned sense of touch and even hearing would attribute to that sense of depth. Distance from you that the noise was heard and what not. At least that is what I would assume does this for those of us without ocular sight.

Answer 4

it doesnot depends upon how many eyes you have .but they can feel it by touching even.it depends upon how you see.if you see a corner with one eye closed you can see all dimensions wall ending there in that point