DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Swollen eyes of a 10-year-old boy with severe hayfever. Periorbital (around the eye socket) fluid swelling (oedema) can result from an allergic reaction as in hayfever. Many substances can act as allergens, most commonly pollen, animal hair and some chemicals. Inhalation of allergens, or contact with the eyes, provokes an excessive response from the immune system. Typical symptoms include a runny nose and swollen watery eyes. Pollen-induced hay fever is seasonal, occurring mostly in summer. Treatment is with antihistamine drugs that help to reduce the reaction.
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