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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So obviously is someone’s eye sight is so bad they cant even function that would have been a problem but one thing to keep in mind regarding “bad eyesight” is that a lot of it only matters now a days.
We have written language, so you need to be able to read really tiny characters some of which look almost exactly the same. If you never need to read (something that most people never did until the last 200 years or so) that’s a non-issue.
Well what about seeing stuff that’s far away? I mean…why would that matter? It wasn’t until recently (again, about 200 years ago tops) someone would find themselves using a vehicle that’s even fast enough that seeing something clearly from several 100 meters is *that* big of a deal. Again, there wasn’t exactly written language you need to read from a sign.
For example, I have glasses but the only thing that I really need them for is driving, and even then only at night and even *then* really only when I don’t already know where to go and need to read signs.
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