It's a temporary sensation with no known long-term effects, nor will it worsen any other conditions, like pink eye. Also, some people may have more sensitive eyes than others, which is why not everyone will tear up when they chop onions but why others may feel the effects on the other side of the room.
Science explained the reason:
Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion. The synthase enzyme converts the amino acids sulfoxides of the onion into sulfenic acid.
Is it harmful?
Your eyes react to the gas that is formed, and your eyes try to flush it out with tears. However, onions pose no serious threat to your visual health. Chopping onions can cause some burning and irritation and tears. Other than that, it's pretty safe on your eyes.
Get rid of it!
Use a sharp knife to cut the onion—you'll release less of the enzymes into the air.
Cut onions in cold water.
Chill or freeze onions to minimize the amount of gas released into the air.
Onion makes your food tasty. Some of you may not like it!
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Eat onions and stay with me :v
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