How much did he weigh before he went off feed? How much does he weigh now? How long did you have him before he went off feed (Fall 2014 or Fall 2015)? What is your setup like now? Temperature/humidity/pictures?

BPs use their vision pretty much last in the "checklist of senses" that kick in in order to eat, so even if it is compromised any, it shouldn't be affecting the feeding response much (if any).