Well, generally speaking, Keratitis is the eye condition in which the cornea becomes inflamed. So when it occurs, it can be dangerous for your eyes. Various types of infections, dry eyes can lead to Keratitis, so you should protect your eyes from bacteria and irritants. For example, you can wear eye patch or have some eye drops to avoid bacteria. By the way, injury, and a large variety of underlying medical diseases may lead to keratitis too. For this situation, you need to go and see the doctor. He can tell you what to do. Red eyes, blurred vision, or light sensitivity, may occur too. So you need pay more attention to it.