system
Given the following post, respond as if you're commenting on Reddit:
human
Do non-human animals need glasses?

Do all dogs and cats and birds of prey have 20/20 vision (or their species' equivalent)? Is visual acuity something that is naturally selected? (You're a nearsighted deer and you can't see the wolf off in the distance, and so you won't survive long enough to reproduce).
gpt
Wild animals don't _need_ glasses, typically.  Almost by definition, your typical animal is capable of surviving without any sort of technological fix like that...after all, all their ancestors did so.  

That said, many animal don't have 20/20 vision (and 20/20 isn't actually perfect, it's just normal good vision in humans-even some people exceed it).  For instance, rats and beavers have poor, blurry vision.  Animals like these make up for their vision with other senses, like smell and hearing, which are often quite a bit better than those of humans.  So how selected vision is depends on how much it's used by the species involved.  For some species like humans, it's under heavy selection.  For something like rats, not so much.

It's worth noting that even in humans, nearsightedness is rare in premodern societies. And based on some cursory reading, it appears that nearsightedness is more common in domestic animals than in wild or feral animals of the same species.  There's probably an environmental component to nearsightedness in these cases.