i'm guessing by he you're referring to gatts and if so the reason why his right eye is closed is because he can't see with that eye. you'll find out how that happens. i hope i didn't ruin berserk much for you.
Heh, how would even mentioning that ruin the whole series?

Finally got around to catching up on Berserk. I stopped all the way back at the arc with the evil faries for some reason. The whole thing with magic is starting to get on my nerves. >_>