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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Our eyes are incredibly precise things. It does not take much to disrupt their function. Evolution is full of little tweaks and changes. If we wiped out everyone with bad eyesight, more would just be born. Fewer, but we can’t expect to get that number close to zero.
However, there is another issue. Modern eyesight issues, even with a genetic factor, are largely caused by the environment. These “bad” genes are only bad in a modern world and did not cause bad eyesight earlier in humanity.
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