I know it works, since I do it a lot, but I have no idea how the hands are connected to the eyes in this particular way.
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Think of the cells of an onion like little rectangular ketchup packets. Its the “ketchup” inside of those packets that causes your eyes to water and sting. When you cut an onion up you cut through those “ketchup packets” and get “ketchup” all over your hands and knife, which exposes it to the air, and then your face. By running your hands under water you wash away the “ketchup” so there is no more irritant to get in your eyes. Also, since the cells are rectangular shaped, you can cut stem to stem to reduce the number of packets you cut open, reducing the amount of “ketchup” you get in your face.
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