Eye, painful red

A common combination of eye symptoms that may be due to any of several eye disorders. Uveitis is a common cause of dull, aching pain. The redness is caused by widening of blood vessels around the iris. Another serious cause of pain and redness in one eye is acute closedangle glaucoma. Other causes include keratitis, usually due to a corneal ulcer, or a foreign body in the eye (see eye, foreign body in). The most common cause of redness and irritation in the eye is conjunctivitis.