Chameleons will roll their eyeballs behind their lids to wash them out, like you'd rub your eyes when they itch, only that they have no hands. If he does this mainly after a misting or when he's gotten water in his eyes, then this is normal.
As for your light, the easiest thing to do if you bought a more expensive reptile heat bulb is to simply lift it up off the cage. You can do this by hanging the fixture cord from the ceiling and lifting or lowering it accordingly, clamping the light on something that's a little above the cage, or buying one of those cheap shelf things you'd get for a kitchen cabinet (for like $5 at Walmart) and resting the light on that. This last thing will lift your light off the cage by like 6" or more, if I remember correctly.
If you are just using a normal house-hold bulb for heat, find a bulb with lower wattage. So if you're using a 75w, for example, try a 40w and see where the temps are. And go lower or higher accordingly.