We had a "low" UVB coil on for about a month before he showed any symptoms. His symptoms did start suddenly right after i increased the uvb output. As soon I noticed his right eye blinking I took the light out immediately (within a couple hours of installing it). I increased the bulb, thinking he wasn't getting enough from the tiny one we had. I ended up reading about how bad they are afterwards.

I switched to linear a few days ago, so maybe it's too soon to tell?
I have to apologize for the picture. His eye didn't stay lumpy or swollen for any period of time, I just took that picture as he was "washing" his eye. Sometimes he inflates them right out, and then closes and swishes them around. It's something I've seen a couple times in intense mistings before. If it is an infection in his eye, he was prescribed antibiotic eye drops, which I hope would keep that in check. (It's called Ciloxan. 'Ciprofloxacin 0.3% Hydrochloride Ophthalmic Solution, USP)
I checked the multivit I'm using and it has no Vit A at all. I give his feeders such a large selection, they may be favouring a less beneficial gut load over the good stuff. I notice that they only eat the carrots if there isn't any other wet options. I'm not too sure how much Vit A is in the other items, but I can't rule a Vit problem out, especially because of his tongue.
I don't think he misses his food because he can't see it. He's fully capable of opening both eyes, and keeping them open to hunt, and move around... if he feels like it. When his right eye was really bad, and not opening much at all, I did see him shoot at his food, but miss. The tongue went out as far as usual, he was just off target, because he was only using one eye. Now it's different. He uses both eyes, if he's interested, and can catch them no problem, as long as they're really close to him. He tries to get some that are out of reach, and it's like his tongue just doesn't shoot out far enough.
I don't plan on reducing my humidity control. I'm having a very hard time getting peaks of 50%, and I really don't want him to go without something to drink for a whole day... especially in his current condition.