Conjunctivitis

Inflammation of the conjunctiva, causing redness, discomfort, and discharge from the affected eye. There are 2 common types: infective conjunctivitis, caused by bacteria or viruses; and allergic conjunctivitis, which is an allergic response to substances such as cosmetics and pollen. Both types have similar symptoms but in infective conjunctivitis the discharge contains pus and may cause the eyelids to be stuck together on waking. In allergic conjunctivitis, the discharge is clear and the eyelids are often swollen. Bacterial infections are treated with antibiotic eyedrops or ointment. Viral conjunctivitis often disappears without treatment. Allergic conjunctivitis may be relieved by eyedrops containing an antihistamine or a corticosteroid drug. Other forms of conjunctivitis include neonatal ophthalmia, keratoconjunctivitis, and trachoma.