Today in class I learned something very interesting about the human eye:
It produces 3 types of tears: basal tears, reflex tears, and crying tears. Basal tears simply keep the eye moist.
Reflex tears are produced if the eye is irritated (cutting onions or a piece of debris). AND now we get to the kicker....Crying tears are produced due to emotions. Humans are the only animals that produce crying tears. Crying tears are very unique in that they contain natural painkillers and a plethora of nutrients for the cornea.
So, if you're upset....why don't you cry about it? It WILL actually make you feel better and keep your eyes healthy in the process. :-)
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