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I'm glad your contacts work when you're cutting onions, but as a general principle, contacts concentrate any airborne chemical underneath. Typically this results in increased irritation. Chlorine fumes would definitely be concentrated, which explains your recommendation not to swim while wearing contacts unless you wear goggles.
Every airborne chemical will be concentrated between a contact lens and the cornea. Onions, chlorine, it doesn't matter.
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The greatness of a nation and its moral progress can be judged by the way its animals are treated. - Ghandi 
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