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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The prevalence of nearsightedness has increased exponentially since industrialization and formal education. Excessive near point strain from lots of studying and reading during childhood and adolescence worsens the severity of myopia. Additionally, lack of exposure to UV appears to worsen myopia.
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