Allergic eye disease is an inflammatory response of the eye to an allergen, resulting in redness, swelling of the eyelids and surface of the eye, itching and tearing. The symptoms can occur seasonally, in specific age groups or with specific risk factors. The diagnosis is made by history and examination. Allergy testing may be considered to identify specific allergens. Treatments include allergy drops, artificial tears, cool compresses, and avoiding allergens.