This would be cool to see! Lots of ways to represent historically unrepresented people in alternative settings.

They probably shouldn't have left. If I was playing I would interrogate the blind person and find out why they don't try to cure it. Do they hate themselves? Do they like the pity parties people throw for them? Is there a neferious force preventing them from curing it? Or is the DM a fucking idiot?

But... That depends on the magic, doesn't it? I'd argue you could easily use magic to fix disabilities. Or do healers not exist in your world?

Let's just pretend that Zatoichi wasn't a thing. NB he might be fiction but the blind swordsman kicked serious ass.