Is it just one eye? Can you perhaps fill out the how to ask for help form (it could be husbandry related.)
If it is only one eye , you can try these two things without any harm (except maybe a little stress) to the chameleon. Buy a sterile, plain saline solution (no preservatives) and squirt a stream of it in his eye so that his turret lifts and fills with the saline. Do this gently of course. This will hopefully dislodge any debris in there. A nice long shower/misting might help too.