Allergic conjunctivitis

What is allergic conjunctivitis?
The conjunctiva is a clear, thin membrane that covers your eyeball and the inside of your eyelids. If an allergen irritates this covering, your eyes may become red, swollen, and itchy and may water. This is called allergic conjunctivitis.

Allergic conjunctivitis is not contagious. Some common allergens and triggers that may cause allergic conjunctivitis include: pollen from trees, grass and ragweed; animal skin and secretions such as saliva; perfumes and cosmetics; skin medicines; air pollution; and smoke.