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I am especially sensitive to this. I’ve found that using a very, very sharp knife can help, but some onions are especially strong. At that point I’m breaking out the swimming goggles.
Run your wrists, palm up, under cold water. It's black magic. It will stop it almost instantly.
I am going to try this, but I’d really like to know why it works. Someone else suggested cold water on the knife. Do the irritant molecules from the onion react with the water on your hands/wrists/knife before getting up in your eyes?
Onion make gas. Gas stick to tear on eyeball. Tears turn acidic, eyeball hurt.
Bring tears to onion, gas already react so no can hurt real eyeball. That why bring water (fake eyeball) to onion when cut.
Gud esplaind
I thought I was the only one who cuts onion with goggles. If I only need one onion I don't need them if I am quick enough, but if I need more than that, I always whip out swimming goggles.
Try slicing a lime or lemon before cutting onions.