Most commonly caused by allergy or infection (bacterial or viral).
Symptoms include an irritated red eye with a watery or purulent discharge.
Allergic conjunctivitis is usually bilateral with watery discharge and itching.
Treatment for allergic conjunctivitis includes topical mast cell stabilizers and antihistamines; bacterial conjunctivitis treatment includes topical antibiotics; viral conjunctivitis requires symptomatic treatment.
Bacterial and viral conjunctivitis is highly contagious; measures to prevent spread of infection should be considered.
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