Why can (most) eyeballs be controlled to go in the same direction as well as cross-eyed, but not in separate directions?
In: Biology
Because looking right or left or at something close at the tip of your nose is something we do but we don’t look in both opposite directions at once. Animals that can look in opposite directions are usually herbivore/prey animals where that’s beneficial to see danger coming whereas stereoscopic vision, like we have where both eye face forwards, is generally how hunting animals have evolved as it helps with judging depth and makes us better hunters.
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