Pink eye is really anything that makes the eye pink. The official term is conjunctivitis, meaning an inflammation of the conjunctiva, the mostly transparent, skinnish like covering over the white of the eye. When the eye is irritated, the conjunctiva swells and blood vessels in it dilate, giving the eye a pink or reddish appearance. Many different agents can lead to this, including bacteria, viruses, allergens, and toxic or mechanical irritants. Treatment and contagion protection depend on the specific cause. Often the cause can be determined based on history, eye appearance with specialized instruments, and symptoms. Viral pinkeye, for example, is typically associated with increased light sensitivity, whereas itching is a key sign in allergic pink eye. There is a good deal of overlap with all kinds, however. Bacterial and viral pinkeye are both contagious, and fairly common. With any pink eye, particularly if it is getting worse, or not getting any better within a day, it’s best to be seen by an eye care practitioner. She or he will have the experience, knowledge and instrumentation to provide the most efficient treatment and recommendations.