I have a barred rock roo that I've had for about two years. When I first got him, he seemed to have something in his eye. I looked in it several times and tried to get the invisible irritant out, but I couldn't see anything. Now he's much older and still has the same problem in the same eye. His eye is constantly runny and it almost looks like his eyelid is too small for his eye! It's not eye worm, he has no white gunk coming out of his eye, and around here a case of eye worm is super rare. What's wrong with him???