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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I personally do not like the phrase, “Survival of the fittest” ‘cause it’s too easy to misunderstand. It should be replaced by something like, “Survival of the just barely adequate.”
A rabbit that can outrun a fox by a mile has no greater evolutionary advantage than one that outruns by an inch.
Our eyes are good enough so this is evidence that improving it provides no benefit in offspring.
A population that has an improvement here is no better off.
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