I'm writing a fic, which is going alone pretty well, and one of the characters is an expert sniper who recently lost his right eye. That's his shooting eye, so what I want to know is, can he become as proficient/almost as proficient a sniper with his left eye, and if so how long will it take him to do this? I already researched how people cope with one eye, but there seems to be little on snipers.
Googled: eye injuries, snipers with eye injuries, one eyed sniper. My google-fu is weak.