The appearance of red eye ranges in severity from a bright red that completely covers the sclera to a few enlarged blood vessels that look like wiggly red or pink lines across the "white" of the eye. Red eyes usually are caused by allergy, eye fatigue, over-wearing contact lenses or common eye infections such as pink eye (conjunctivitis). However, redness of the eye sometimes can signal a more serious eye condition or disease, such as uveitis or glaucoma. If your red eye persists or worsens, always contact your eye doctor for proper diagnosis and treatment. Common Causes of Red Eye Conjunctivitis. Also called "pink eye," conjunctivitis is one of the most common (and contagious) eye infections, particularly among school children. It occurs when the conjunctiva — the thin, normally transparent membrane that covers the sclera and lines the eyelids — becomes infected. @medicalcortex #medstudent #surgery #nurse #doctor #eye #blood #surgery #ophthalmology #f4f #l4l #premed #usmle #medical #medicine #red #monday #coffee #diabetes