People who don't qualify as legally blind but have extreme vision impairment would like to talk to you. My stepson is profoundly deaf but still has hearing and wears hearing aides to assist him, he'll often read lips during conversations to supplement that audio information and that can result in pretty big communication breakdowns.

Pretty much everything in life is a spectrum of possibilities - trying to boil those down to binary states can be helpful for some purposes but is never clean.

Well, it's undoubtedly a condition but there are probably some who dispute whether it's a "disease" or "disability". This resistance is more commonly associated with the deaf community, and drawing parallels between this population and the trans population will get you in hot water pretty quickly..

Yes there is.

Being "legally blind" is a thing. The cut off for how little vision is enough to be blind is debatable.

Not that simple.

I would imagine that the rate of violent attacks on blind individuals specifically due to their blindness is also lower than hate crimes against Trans individuals.

I don't hear about a lot of amputees being dragged behind pickup trucks for not having as many limbs as their attackers, but maybe I'm not reading the right publications.