Thanks for your reply Yvonne..I'm not seeing the same thing you are. It looks fine to me. More than likely, he just scratched it or got a piece of substrate in it or something. You can try flushing the eye with an eye rinse or saline solution, and dab on some eye ointment.
If it's physical damage or scratch, what can I do to fix it? Can it heal or will it damaged forever?I agree that the bulb should be switched but I don't think this is the issue. That would cause problems with both eyes. When it's one eye it's typically physical damage to that eye, like a scratch.