Yang Yang's suggestion is correct. Wearing an eye patch can effectively reduce the irritation to the eyes when cutting onions. When the onion is cut, the gas released by the onion will combine with the moisture in the tears to form sulfuric acid, which is the main reason for the stinging tears in the eyes. Eye patch can block the gas released by onion and prevent onion fragments from splashing into eyes. In addition, if you don't have an eye mask, you can put onions in the refrigerator or cold water for a while before cutting them, which can reduce the release of gas. You can also use a sharp knife or blade to cut onions, which can reduce the number of onion fragments, thus reducing the degree of eye irritation. In short, wearing an eye mask is a very effective way to help mothers reduce the problem of tears.