Pink eye (conjunctivitis) is a common eye infection caused by bacteria, viruses or allergies. The disease is easily transmitted through the respiratory tract, or direct or indirect contact with eye discharge from an infected person. The disease is very common and easy to treat.

Pink eye is caused by bacteria or viruses. The disease is characterized by red eyes and discharge, usually red in one eye first, then spreading to the other eye. Most people with pink eye will recover on their own after 7 - 14 days. When having pink eye, doctors often advise patients with pink eye to wear sunglasses. So why do you have to wear sunglasses when you have pink eye?