Overview of Conjunctivitis - Etiology, pathophysiology, symptoms , signs, diagnosis & prognosis from the Merck Manuals - Medical Professional Version. Conjunctivitis , commonly known as pink eye, is a widespread eye condition that affects people of all ages. While it is typically not severe, understanding its causes, symptoms , and treatments can help you manage it effectively and prevent complications. Pink eye is the inflammation or infection of the transparent membrane that lines your eyelid and eyeball. Learn about the common signs, possible causes and how to prevent the spread of this contagious condition. Pink eye, also called conjunctivitis , is an infection of the eye's conjunctiva usually caused by a bacteria or virus that results in red, itchy, painful eyes.
