Seriously though, I can't imagine someone would like to stay blind.
Blindness builds character.
seriously though, if you can't imagine why someone would want to stay blind, then you probably won't get what i say next.
imagine an old nord warrior, who in a moment of pride, let himself get drawn into a duel he could not win. he is blinded in one eye, and although a healer uses magic to save him, he wants to stay blind, so they healer submits and lets him. why would he want to stay blind? as a reminder so that he will never forget what happened to him and why.
understand?