Are both eyes crusty? I had that issue with my female panther Cham and my vet gave us some eye drops to get rid of any infection that might be present in her eyes. If it started as one eye and now it's both, it could be a vitamin A deficiency. We just resolved a vitamin A problem with my juvenile male veiled Cham. If you're really worried about it, take it to a good herp vet and see what he/ she says.
Also, if you're feeding you're Cham mostly meal worms, i would change that. I've been told that meal worms should only be fed to your Cham every once in awhile, not as an every day meal. They're more of a treat. I mainly feed my chams crickets with meal worms every so often.