Try moving your lights up higher off your cage. Sometime the lights can irritate their eyes. What type of plants are you using. Some plant could also bother their eyes.
As far as how long to adjust I think that would depend on the chameleon. Some out of the cage time is a good idea and try some different feeders. That might spark his interest.
I am very sorry to hear about Sid. I am so sorry you have to go through this. Chameleons should have long life spans like some birds and turtles. Know that you gave him a wonderful life and did all that could possibly be done for him.
My deepest condolences go out to you and your family.
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