Flow chart displaying illustrated steps of the allergic cascade and where in this process antihistamine treatment inhibits an allergic response within the eye. When antihistamines are used as a treatment for allergic reactions, they are able to block histamine from connecting with the H1 and H2 receptors on nerve tissue, which prevents symptoms of itchiness, redness, and watering in the eyes.

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Photo credit: © Photo Researchers / Alamy / Afripics
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