More watery discharge is associated with viral conjunctivitis. This typically starts in one eye, spreading to the second eye over a few days. It may coincide with a respiratory infection such as flu. A person will also usually experience swollen lymph nodesin front of their ears. Pain, light sensitivity, and redness are more prevalent in viral infe...

When an allergy causes conjunctivitis, both eyes are usually affected. Itching, swelling, and excessive tearing are common symptoms. Discharge tends to remain clear. Learn more about allergic conjunctivitis.

Foreign bodies, eye trauma, and chemical exposure are all examples of irritants that can cause conjunctivitis. Symptoms tend to be redness, swelling, and excessive tearing.