Question

Why do we have two eyes instead of one?

Answer 1

The problem of parallax error in vision is reduced a lot because of this double eye vision. It also enhances our depth perception giving us a very good evolutionary advantage. Also, our ability to detect faint objects is more distinct. Thanks to our 'two' eyes, humans are able to enjoy stereoscopic vision.
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Answer 2

While, when you see only with your right eye, the object will look like this. Our eyes send these twoslightly different images to the brain. The brain blends or combines both the images to make a three dimensional image of the object.