I'm not sure I understand what you mean. Does the iris of the eye look different than the other eye? In what way? Are the lids stuck shut in the mornings? Is he rubbing it as if trying to clean it? Any colored discharge? If the answers are yes, a vet needs to examine the eye for injury or inflammation.
Find the "how to ask for help" sticky message and answer the questions. We need more information to help you rule out possible problems due to husbandry.