Does Roy Mustang stay blind?
Yes he does. In the manga, he was thinking about retirement(since disabled soldiers not allowed) but then accepts Marcoh’s offer to cure his blindness. In Brotherhood, he still wishes to continue in the military despite blindness but accepts to get cured by Marcho’s philosopher’s stone. Nov 8, 2020
Does Mustang go blind?
Later, the homunculi attack Mustang, forcing him to use alchemy to become the fifth human sacrifice needed for their leader. This results in Mustang losing his eyesight as part of the sacrifice, although he continues to fight with Hawkeye to help him direct his attacks.