[quote=@ClocktowerEchos]
[@TheRedWatcher] Partially blind like they're missing an eye is fine but it they're almost blind that might be an issue. Along with with deafness (assuming total deafness), its unlikely they would actually be in a position to take place in the RP beyond a diet Tyrion Lannister. There's nothing like sign language so they'd have to just write out everything and glassmaking in use for lens hasn't gone beyond telescopes and navigational equipment.
[/quote]

Actually:
https://medievalfactsexaminer.weebly.com/articles/sign-language-in-medieval-era#:~:text=The%20Monastic%20sign%20languages%20were,instead%20of%20an%20actual%20language.

They didn't have what we would consider American Modern Sign Language or the Sign Language that we would consider used today, but they actually did have sign language. As well as written language. I have actually done this research before for my own fantasy themed novel once with a Deaf character. 

Also Emperor Hadrian was rumored to be hard of hearing. According to one account: Hadrian was so deaf that he had to cup his hand behind his ear, even while riding into battle.

There are differing degrees of Deafness as well beyond just Full or Partial.