Yes on both accounts.
I have mild myopia and rounded shoulders. I think both are hereditary.
I try to keep my back in alignment by rotating my pelvis forward (sticks my butt out) and my head up, however my body prefers to slouch. I (cat) stretch my back at least every other day, usually after tiger push-ups. Standing in the 'horse' position also forces everything into a better position, but whether it helps long-term I have no idea.
I do struggle with lower back pain, but there isn't anything to do about it. Anyway, physical pain doesn't bother me as much as everything else going on.