Allergic conjunctivitis Health Article

Definition

Allergic conjunctivitis is inflammation of the tissue lining the eyelids (conjuctiva) due to a reaction from allergy-causing substances such as pollen and dander.

See also: Conjunctivitis

Alternative Names

Conjunctivitis - allergic

Causes, incidence, and risk factors

When your eyes are exposed to anything to which you are allergic, histamine is released and the blood vessels in the conjunctiva become swollen (the conjunctiva is the clear membrane that covers the "white" of the eye). Reddening of the eyes develops quickly and is accompanied by itching and tearing.

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 are often lumped under the term allergy. Keep in mind that rubbing the eyes makes the situation worse.

Symptoms

Symptoms may be seasonal and can include:

• Red eyes
• Dilated vessels in the clear tissue covering white of the eye
• Intense itching or burning eyes
• Puffy eyelids, especially in the morning
• Tearing (watery eyes)
• Stringy eye discharge

Signs and tests

Your doctor may look for the following:

• Certain white blood cells, called eosinophils, in scrapings, secretions, or discharge
• Small, raised bumps on the inside of the eyelids (papillary conjunctivitis)
• Positive skin test for suspected allergens (See: Allergy testing)