There is a blind spot where the optic nerve enters the retina of your eye. Yet, we don't see a hole in our field of vision. Scientists always thought that this was because our brain simply ignores the ever-present blind spot. Research has shown that an even more complex system erases that blind spot. 

Ref: B. Bower. "Vision System Puts Eyesight in Blind Spots." Science News, Vol. 139, p. 262. Photo: Blood vessels of a normal retina. The blind spot would be at the extreme left.

 

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