Final answer:
Viral conjunctivitis is caused by viral infections and characterized by inflammation of the conjunctiva and watery discharge. Allergic conjunctivitis is caused by an allergic reaction and characterized by inflammation, itching, and watering of the eyes.
Step-by-step explanation:
Viral conjunctivitis is caused by viral infections, particularly adenoviruses, and is characterized by inflammation of the conjunctiva and watery discharge from the eye. It may be associated with symptoms such as fever and itchy eyes. Allergic conjunctivitis is caused by an allergic reaction to allergens such as pollen or pet dander, and is characterized by inflammation of the conjunctiva, redness, itching, and watering of the eyes. Unlike viral conjunctivitis, allergic conjunctivitis is not contagious.