this thread should probably be moved to the health clinic subforum, so others can chime in
Dont turn off the UVB, its needed and the 'UVB bad for eyes' thing tcomes from when the CFL UV bulbs were first coming out and werent in the proper spectrum (went into UVC and caused cellular damage). They're issues that have been rectified as far as I know.
off hand, it doesnt look like a shedding issue, and it doesnt look terribly infected. How does the other eye look comparatively? How long as he been doing this? Someone else will have to give their two cents, but if I had to guess I'd say there's either something in his eye or its the beginnings of an infection