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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One answer I have not seen yet is that modern life contributes to our poor eyesight. Focus on things close up all of the time and your eyes struggle to focus at a distance (i.e., you become nearsighted). This is a much bigger issue with computer jobs than it was for our ancestors.
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