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When a person is spying from around a corner with only one eye, it's rather easy to ignore the other eye's image, since it's probably much darker, because one usually spies around a corner standing close to a wall.

But if both eyes get equally bright visual input, it takes some effort to try and stay focused on just one of them. What processes in human body allow such action?

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See Binocular vision –  WYSIWYG May 1 '13 at 11:46

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