Given natural selection is true, why do we still have genetic eye sight issues? Because I would think bad eye sight would get you killed (or at least the inability to eat) in a hunter gatherer society.
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Bad eyesight and bad enough eyesight to get you killed are two very different things. Humans have also been able to care for their sick for a very long time, leading to and increase in those who would have been too sick to pass on their genes.
Humans are social animals, so if one has bad eyesight, all of the others who see the hungry lion are warn and protect the one who didn’t see it.
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