ONION v/s EYE

WHY DOES AN ONION MAKES OUR EYES WATER??




Our eyes are really watering all the time, that is to say, we are producing tears that pass over the eyeball and keep it clean. That is why we blink, to carry the tears that appear under the upper lid over the surface of the eye. These tears escape into the nose. We say that our eyes water when the tears form so quickly that they cannot escape quickly enough, because then we see them water.
Onions give off something to the air which excites the ends of the nerves of smell in the nose, and also excites the ends of the nerves of the touch in the eyeball and eyelids, and so send a message  to the brain telling the  tear-glands to make tears quickly; and then we say that our eyes water. There is use in this, for the rapid flow of tears helps to protect the eyelids and the eyeball from the stuff the onions give off. In people who, for some reason, cannot produce tears, such things as onions will make the eyes smart severely, because such people cannot protect themselves by making their eyes water.


(source: TBOK v7 4639)

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