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
Your brain receives two different images, so it can piece together a single image better. Much like how you can discern details from an event better if two nearly identical pictures of the same instance are taken versus if only one picture is taken.
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.
Think of eyesight as two cones that leave each eye and cross paths in the middle so what you focus has two seperate images(one from left field of view one from right) the advantage of it is you have two coordinates that so you can pitpoint the ecact location on the given space but with one eye you only can estimate it.
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