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[Leafsnail]

Yeah, if you go cross-eyed.  Or just allow your eyes to go out of focus (by, say, looking at a distant object then to your hand without focusing on it).

[Darvi]

Can you give yourself double vision on will?

Try squinting.

Yeah, if you go cross-eyed.  Or just allow your eyes to go out of focus (by, say, looking at a distant object then to your hand without focusing on it).

Damn.

I am exceptionally good at that. Like, right eye goes up while left eye goes to the right or something.

[GlyphGryph]

Its possible to have depth perception with only one eye. Its not as good, but its still there.

[Leafsnail]

Hmm... well, obviously you have to adjust the lense in your eye to bring something into focus, although this is basically subconscious.  I guess it might be kindof possible to work out how much your eye is straining to focus on something?

[Max White]

Try squinting.

Some people with no depth perception, myself included, can just give themselves double vision on will without going cross eyes or squinting. It is because their brains are not used to being able to put the two images together into one, so we get two images over lapped instead.

Its possible to have depth perception with only one eye. Its not as good, but its still there.

It depends very much on being able to see something connected to the floor or walls. Something floating mid air is very hard to see depth in. Being able to walk partly around the object helps though.

[Jay]

Is it something like this?

If it's the binocular one, you can probably help it (and look kindof badass) by wearing an eyepatch.  If it's monocular, I guess not.

Haha, something like that.
-The images they produce to show people what double vision "should" look like are always silly -- the images are, in reality, virtually identical, apart from the small difference from the differing eye point of view (in binocular DV, at least -- no idea what monocular looks like) and there's definitely no transparency involved
-Mine is not caused by any of their listed causes.  Like I said, incredibly rare.
An eyepatch would work, but I also wear glasses.  Not so good.
(Eyepatch + monocle?  Ridiculous-looking guy, right here)
(Contact[s ]?  Yeah...  I can't wear them :X)

But I'm getting off-topic, here.
Not having depth perception sucks.

Its possible to have depth perception with only one eye. Its not as good, but its still there.

No.  Depth perception, as we (or I suppose I should say "you") know it, is created by the triangulation of the third point (the object) and the two viewpoints of your eyes.  It is impossible with only one eye.

[Leafsnail]

Hmm... corrective sunglasses where one of the lenses is actually secretly completely blacked out?

[Armok]

Like this: http://en.wikipedia.org/wiki/Stereoscopy#Wiggle_stereoscopy

 

Or, if you meant in a more practical sense and less philosophical one... you know how it's easier to see how far away things are in thick fog? It's like that, except the fog is invisible.

[anzki4]

About the seeing in 3D. You can see thing in 3D with one closed (if you can normally see in 3D) because your brain somehow "remebers" 3D vision and "simulates" it. That's how it was sometime explained to me.

I have since that thought about experiment; how long you would have to wear an eyepatch for your brain to "forget" the 3D vision, and to see things in 2D....

[Armok]

That's not quite how it works. Everyone's brain *always* gets information in 2d and *always* simulates 3d. Stereoscopic vision is just an extra source where the brain can get information to make the simulation more accurate.

Thus, there is no amount of time wearing an eyepatch that will make the brain forget 3d. People who have been blind for decades will still imagine things in 3d. I think the framework is also mostly genetic anyway, not learned, but I'm less sure of that. That is, people who had never seen still having a 3d-ready brain.

If I understand things right, the thing that's gone wrong in the OPs brain is the mechanism to process two image streams into depth data for the perspective simulation, which would decrease it's accuracy but not it's saliency.

[GlyphGryph]

No.  Depth perception, as we (or I suppose I should say "you") know it, is created by the triangulation of the third point (the object) and the two viewpoints of your eyes.  It is impossible with only one eye.

The brain doesn't use anything as fancy as proper triangulation. It uses a lot of different cues to make an educated guess, and binocular vision is only one of the stronger ones.

And, as mentioned, the way single eyes give you depth perception is basically by determining it one or more of the many many other cues. Accomodation through stretching of the ciliary muscles, for example, which is part of focusing, is a very strong one, though it only works for nearby objects. It's often strong enough to override binocular cues. You've also got distance fogging, motion parallax, perspective convergence (easily fooled, but it does work most of the time), textures, occlusion, and a host of others. And of course knowledge of how big things actually are.

All of our senses our faked based on pretty limited data, so the brain is very very good at using other information to fill in the gaps.

Edited to add: Actually, a whole BUNCH of these override binocular vision in particular circumstances - that's how a lot of visual illusions work, after all.