I have a couple of questions.
What substrate are you using?
Do you have plastic decorations?
How many corys were with him?
Do you have any aggressive fish?
I was reading a couple more posts about albinos losing their eyes and it's mostly been from substrate injuries, decoration injuries, if he was too stressed because he didn't have enough friends or that there is a bully in the tank who decided to play slender man and scoop out the eyes
do you have any aggressive fish?