I have an aquaeium with jeweled curly tailed lizards in it. At one time I had five some years ago. One by one over the years, months aparts from each other, they have developed some kind of infliction to their eyes. They get some kind of black crust over their eye, usualy more to the front of it. It starts on one side, but after awhile spreads to the other as well. Once it's done that they're blind, start to get a lot less active, and pretty much seem to starve to death since they can't see food anymore.
Does anyone know what this could be that hits them so far apart from previus ones, or of any possible way to treat it? Simply cleaning their eyes doesn't seem to help at all.

