that's interesting MIke...
Joel, keep a close eye on what the cuttle is doing... he may be bumping into the glass or rocks etc... I had seen that on one cuttle i had that never seemed to watch where he was going and would get abrasions on his eyes.
Also, this is hopefully premature, but cuttles eyes do give away the start of senesence... they get a type of cataracts effect, is that what you are seeing or is it a fungus?