Two Eyes are Better Than One
Explanation: Your eyes don't see things the same. They see the same thing but at a slightly different angle. Your brain takes both views and combines them into one 3-d image. This kind of vision is called stereoscopic vision. When you cover one eye, you no longer see with stereoscopic vision, instead you see things two-dimensional, like a photo. This makes it hard to judge distances. People who lose sight in one eye learn to cope, but it is harder.
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