My grandaunt rinsed my eyes with urine to give me good eyesight
Some of the ancient Chinese customs that I have heard is by rinsing your eyes with the urine of a boy (who is still a virgin) in order to have a good eyesight. She really did this to me when I was too young to know what was going on. And funny enough, I have relatively good eyesight for most years of my life even though I spent long hours in front of the computer most of the time.