Allergic conjunctivitis

Definition:

Noninfectious allergic conjunctivitis is a reaction to the introduction of materials to which the person is allergic, such as pollen, dander, and so on. The reaction results in the release of histamine with subsequent dilatation of vessels in the conjunctiva. Reddening of the eyes develops quickly and is accompanied by itching and tearing.

Causes, incidence, and risk factors:

Allergies tend to run in families, although no obvious mode of inheritance is recognized. The incidence of allergy is difficult to determine, because many different conditions often are lumped under the term allergy. Keep in mind that rubbing the eyes makes the situation worse.