Topical Olopatadine Hydrochloride versus Ketotifen Fumarate for Allergic Conjunctivitis.

Purpose: Allergic conjunctivitis (AC) is associated with itching, redness, tearing, pain, and burning sensation in the eyes. The inflammatory process is caused by the mechanism of immediate hypersensitivity due to direct contact with the allergen. This process triggers mast cells in the conjunctiva to activate and release mediators.