Given the thinness of the tail and legs to where you can see the individual bones, I would echo the above post and say the animal is beyond the point of no-return. It's probably not going to open its eyes again unless you can hydrate it substantially.
But, if you've got the fortitude for it, you can prying the mouth open, getting a meaty, gutloaded cricket/roach, squash its head so it doesn't move (the cricket, not the chameleon) so it stops scrambling so much, and put it head-first into its mouth, hoping the bug touches the tongue. It will either close its mouth instinctively and begin chewing/swallowing it, or it will spit it back out.
You also want to try putting it near the ground (you don't want to strain it by forcing it to grip a branch) and drip water/mist water on its head so it gets the sensation of the droplets, and can lick it off the ground below its chin. Even create a puddle below its chin.