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The Optilast eye drops solution offers quick relief for allergic conjunctivitis. This is a condition that affects the eyes and causes symptoms such as itching, swelling, and puffiness. Itchy, watery and puffy eyes are some of the symptoms. The active ingredient of this antihistamine is azelastine hydrochloride, which is also an antihistamine. Mast cells are a group of cells found in the eye. The eye's immune system is controlled by mast cells. Histamines are substances released by mast cells in response to allergens. This causes the eyes become watery and inflamed. Pollen, animal fur and dust mites are the most common allergens. Azelastine hydrochloride stops these cells from releasing histamine which decreases inflammation.Buy Optilast Allergy Eye Drops