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Easy to diagnose. It's dehydration, period. NOT to be confused with fasting or lack of food. If it was a hunger issue, he would be more boney and you could see his rib bones sticking out. My crested geckos had sunken eyes while I was a way on vacation. I put a water bowl for them w/o any food. Within the next morning it was gone. This was done before I even had a chance to offer them food. Poor a bottle of water next to him. then trickle it on his mouth. Let him take gulp fulls of water. Do this for a few days. He'll be better.
What leads you to that conclusion? Nobody even suggested that his lizard suffered from a lack of food or was actually a crested gecko. Sunken eyes generally point to a dehydrated chameleon, but really urates are the ultimate indicator for that and this particular chameleon seems otherwise very healthy. So I'm just curious why it's so easy for you to diagnose.