When you lose the vision in one eye, whether the eye is still present or not, you lose your depth perception. This is because depth perception is based on the brain cross-correlating the images coming from both eyes, and processing the slight differences caused by the fact that they are a couple inches apart. Consider that depth perception gets progressively less accurate as the object you're looking at gets farther away (for instance its easy to tell about how far in front of a tree someone is standing if they're only fifteen feet away from you, but if they're a hundred feet away, it's almost impossible to accurately estimate the distance between the person and the tree. You can still see that they're in front of it, but you can't tell whether they're three feet in front of it or ten feet in front of it.) — the differences in the two images are smaller and smaller.
If the eye was removed, the socket would be empty. There would be a space, not large and not spherical, but large enough that a sufficiently small, properly-shaped item could be placed in it (after all, that's what a false eye is — a sufficiently small, properly shaped item, placed in the empty socket.)
here's a photo of a post-removal eyesocket◊
It's a cat, not a human, but it would be essentially the same. this is a series of photos showing someone inserting a false eye.◊
You can kind of see what the empty socket looks like in the first (leftmost) one.
edited 21st Jan '13 7:04:38 PM by Madrugada
...if you don’t love you’re dead, and if you do, they’ll kill you for it.