Pink eye, medically known as conjunctivitis, is a condition characterized by inflammation of the conjunctivae, the transparent membrane that lines the eyelid and covers the white part of the eyeball. When the small blood vessels in the conjunctiva become inflamed, they become more visible, resulting in the eye's characteristic pink or reddish tint. Pink eye is one of the most common eye conditions. Although it is usually mild, depending on the cause, it can ...