Hi, my boyfriend had really bad problems with his eyes during the summer when it is hot! They go extremely red and watery and he gets an awful lot of gunk stuck on the eyeball that a lot of the time his eyes are too dry from him to he about to get it off, but they are usually really long bits almost resembling someone's head hair. He complains that it feels like he has glass in his eyes or sand paper rubbing against his eyeballs. He has had his eyes tested and has perfect vision and he says the reoccurring problem doesn't affect his vision at all. He had previously been told he suffers with dry eye syndrome, but all of the drops he's been given don't help. This problem only ever occurs when it is hot outside. Please help!! Thanks.