I've been asked to chime in--
I personally agree with virtually all of the facts and points written about here. And all of the eye cases that I've looked at since being active in the forums were all from different causes. So to the OP, if you were hinting at an unknown disease entity or a bad batch of vitamins, etc., I do not believe that is an issue.
My chams too come down with an occasional eye irritation of one sort or another, and it's not diet related and I use artificial plants. I just finished construction of my GOC (need to post in the enclosure forum) and they'll be moved into it within a few weeks and get a lot more rain and automatic water, and I'm curious whether I will see less issues. And I probably will; chams just have that funky little crater in the middle of their turret eyes without any lashes or heavy tear flow to keep things out, and no pinky to pick something out in the mirror while making the long face that we all do when getting something out of our own eyes (ever notice that?). So they are constantly getting little minuscule crudlets in there. Water without chlorine is certainly the best natural help.
As for Terramycin, it is an antibiotic, oxytetracycline. It is prescription but is sold all over, dunno why. Personally I use gentamicin ointment since that's specific for gram negative bacteria which cause most reptilian bacterial infections. But many people seem to do just fine with Terramycin. IMO its probably less due to its antibacterial spectrum and more from the lubrication of the eye with petroleum jelly which is the vehicle in all eye ointments.
dr. o—