See if you can locate another vet that has experience specifically with chameleons as they have a very defined set of health troubles seperate from the majority of other reptile species. Here is a good place to start your search for another vet:
Veterinarian resources
The problem is wax worms are high in fat and should not be a staple, and they are actually relatively dry and low in moisture compared to silkworms and hornworms, though I wouldnt be feeding hornworms to chameleons that are having health troubles, especially with sight, as hornworms can inflict a damaging bite.
Conduct a series of tests to check is reaction to visual stimulation. Try to increase and reduce the amount of light that is in the cage. Se if he will respond you your hand movements and feeders in the cage.
At this point I think its important to go over all the factors, including husbandry and history. Answer these questions.
If your chameleon is having problems and you want input from other chameleon owners, be sure to include as much information as possible:
1. Cage type: What size and type of cage (screen, glass, etc.)?
2. Temperatures: What is the basking temperature? How do you measure the temperature in your setup? What is the temperature in the warmest spot? The coolest spot? At night? During the day? You should measure the temperature of the chameleons' skin or the surface of its current branch to get a more accurate reading. Do you leave any heat on at night? What is the temperature in the room at night?
3. Lighting: What brand is your UVB light? How long have you been using it? How long are your lights on each day? Do you leave any lights on at night? Where are the lights? on top?
4. Humidity: Do you have a humidity gauge? What is the range of relative humidity (RH) from lowest to highest? How long does it take to go from high to low? Do you use a humidifier? Do you live in the north or south (or other)?
5. Water: Have you observed your chameleon drinking? How often do you mist? Do you have a dripper?
6. Food: Have you observed your chameleon eating? What is the chameleon's diet? Where do you get your live feeder prey? What are you feeding the feeders? Fresh veggies? Gut load? If you use a commercial gut load what is the brand? If you make your own what are the ingredients?
7. Supplements: What type of supplement(s) do you use? Brand name(s)? How often do you use supplements?
8. Plants & branches: What plants do you have? Are your plants alive or fake? Do the plants provide lots of coverage where the chameleon will feel safe? Can you see your chameleon most of the time or can it hide from your view?
9. Chameleon facts: How old is the chameleon? Do you know if it is wild caught or captive born? Did you get the chameleon at a show? Breeder?
10. Handling: Do you handle your chameleon? How often and how long? What is its reaction to you? Is the cage in a quiet part of the house or is it in a busy or noisy area? Any big stereo speakers near the cage? Is your chameleon alone in the cage? Can your chameleon see any other herps or pets from the cage?
11. Veterinarians: Do you have a veterinarian who KNOWS chameleons?
