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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In addition to what the others have said, bear in mind that basically every single trait is influenced by environmental factors. In this case, there’s some evidence that not being exposed to enough sunlight when in childhood will cause your eyeballs to develop nearsighted! So whether your eyesight is good or bad is not just a matter of genes. Hunter gatherer societies spend a lot more time outdoors than modern humans who go from their homes to a school building or work building every day.
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