I think you sort of missed the point of Brad's reply. This may very well NOT be an eye problem. Yes, a closed eye CAN be a symptom of Vit A deficiency, but if undiagnosed by a qualified vet and you administer Vit A you can end up with an excess of Vit A and have a whole new set of problems. It is not water soluble like Vit C and some others, meaning it is stored in his organs and not excreted like water soluble vitamins and minerals are and therefore can become toxic.
Look at Cyrus. After the dry eye seemed unresolved I did use Vit A but UNDER THE GUIDANCE OF MY VET AND A CHAM SPECIALIST via email, which ultimately was not the cause either.
Do you HAVE a vet? Have you looked for one in your area? He needs to fully assess the chameleon and one of those things is to open his mouth to look for infection. Eye problems can actually be a sign of internal (organ) problems, URI, mouth abscess, tumor and others. So, as Brad said, you need to see a vet, pay whatever it takes and don't skimp. We do not want to hear how your cham died due to your negligence in not getting him to the vet on time. Some people may think that I go overboard with vet visits and they can say what they will, but often it is to rule things out. Yup, cost me a lot of $$, (that should have gone to taxes), but Cyrus, like all my other animals, is fully dependent on me for his care, health and safety - just as you are responsible for Curly. Even after all of this and my care he has vision impairment, but at least I know what it WASN'T and that I took steps to catch anything early.
So I suggest you find a vet who knows chameleons and get him there on Monday.
We will be interested in what he has to say.
lele