For example, someone with 15/20 vision in either eye may be able to see 20/20 with both eyes. What enables you to see more sharply than either eye individually?
In: Biology
Humans are predators. As such we have stereoscopic vision. Your eyes are slightly apart, but can both focus in a singular object giving your brain twice the amount of information to put together. Prey animals have eyes on the sides if their heads which gives them an increased visual range around them, but not the ability to focus well on something in front of them. This is why a prey animal like a horse turns his head to make eye contact instead of staring straight at you.
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