Grease under the eyes of football players -- dumb or not? Maybe this is silly question, but why do football players put grease under their eyes? I've always assumed that it's supposed to reduce glare, but this seems to make little sense considering the angle of the incident light, which mostly comes from above. There could be some reflection from the turf, but this would seem insignificant. If this is the reason, then why don't baseball players do it, considering that fielders have to look skyward? Actually, one of last year's super bowl quarterbacks, Kurt Warner, did not have grease under his eyes, but the other quarterback did. Perhaps Warner knows it's nonsense and the practice is just based on someone's pet theory that caught on. Warner, by the way, is one of the most accurate passers in NFL history (second in career completion percentage according to Wikipedia). But maybe it's not about glare. Am I wrong?