What Is It?
Keratitis is an inflammation of the cornea, the outermost part of the eye that covers the pupil and iris (the colored ring around the pupil). The most common causes of keratitis are infection and injury.
Bacterial, viral, parasitic and fungal infections can cause keratitis. An infectious keratitis can happen after an injury to the cornea. But an injury can inflame the cornea without a secondary infection occurring.