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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Most over-the-counter eye drops are good for four to six hours and relieve itching almost immediately, without any side effects. One OTC eye drop, Zaditor, relieves symptoms for up to twelve hours with only one dose. In severe cases, you can talk to your doctor about using steroid eye drops to relieve the pain.