Conjunctivitis, also known as “pink eye,” is an inflammation of the conjunctiva (the membrane lining under the eyelids) and can be caused by allergies or infections. Both have similar symptoms, such as redness, itching and swelling in the eye area. However, when conjunctivitis is caused by allergies, both eyes are usually affected. Viral or bacterial conjunctivitis can affect either a single eye or both eyes. It is important to pinpoint whether someone has conjunctivitis because of allergies or infection since each condition has a different treatment.
Common symptoms of allergic conjunctivitis are: Redness and itching under the eyelid; excessive watering; swelling of the eyeball
Common symptoms of conjunctivitis associated with infection are: Feeling that eyelids are glued shut upon waking; sensitivity to light; pus on the surface of the eye; burning sensation.