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The brains of birds, and indeed the brains of many others who have the field of view of each eye does not intersect with the field of view of the other, are even easier than humans.
A person has two images of the same �at the same time enter the brain, but they are different!
Look without moving your head, closing one eye, then the other. Make sure that the relative positions of the items are slightly different. This provides stereo vision.
And nothing, the brain copes by building one of the two images with a sense of volume.
Here's a little bit:
What is parallax?
And other animals preferred a larger field of vision and spread their eyes far away. Their brain simply reduces images from two eyes to one picture.
The blind field that exists in this case is a similar problem for them and for us, which is solved by the fact that the head moves, the body moves, a very small movement is enough to block this blind spot.
Pigeons (and other birds, pigeons you can often find doing this) constantly move their heads back and forth.�
http://www.youtube.com/embed/eVwS6ml9mdM?wmode=opaque
In particular, they solve the problem of the blind spot, and provide information to the brain for building a three-dimensional image, since to feel the volume, you can not only look with two eyes, but also look at the same thing in motion (this also gives a shift in the foreground relative to the background).�
By the way, in humans, each eye has a blind spot, but in our case, the other eye overlaps the other's blind spot. �Wiki with instructions on how to detect it.