axiom. 1  a self-evident truth that requires no proof. 2  a universally accepted principle or rule. 3  Logic, Mathematics. a proposition that is assumed without proof for the sake of studying the consequences that follow from it.
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+ Side Effects. Pataday eye drops are a type of antihistamine that is used to treat redness and itching in the eyes caused by allergies. It is available on prescription and it is not recommended for those who have irritations as a result of wearing contact lenses.