Can you briefly explain about keratitis?

Eye inflammation: Keratitis is a condition in which the eye's cornea, the front part of the eye, becomes inflammed. The condition is often marked by moderate to intense pain and usually involves impaired eyesight. Keratitis has multiple causes including infection, exposure, contact lens use, and many others. Treatment depends on the cause of the keratitis.

Various causes: Keratitis is a non-specific term that essentially means inflammation of the cornea. It can occur at different layers of the cornea, and for different causes.