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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Alone, the pressure would get you killed, but we hunted in packs, so in MMO parlance, those with the best eyesight could carry the hunting party for scouting and spotting, like Legolas.
Those with bad eyesight might have had better hearing, or endurance, or swimming skill, or a stronger throwing arm or back, and even if you had none of that, somebody had to keep the ladies happy while the hunting party was away. We weren’t always monogamous.
Women tend to have better color differentiation, and men tend to have better motion tracking, which makes sense when you think of traditional hunter/gatherer roles of hunting reserved for men, and gathering reserved for women.
Lastly, we’ve only been living past 40 for the last couple hundred years, so the impact of age-related macular degeneration and astigmatism in post-childbearing years had very little, if any impact on a society’s chance for survival.
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