Keratitis refers to the microbial infections. If bacteria, fungi or external objects enter the cornea, the cornea tissue can be damaged, causing infection and inflammation. Keratitis may lead to severe pain or blurred vision.

The following factors often cause keratitis: bacteria, virus, fungus, parasite, eye injury, autoimmune diseases (e.g. rheumatoid arthritis and etc.).

Anti-bacterial or anti-fungal eye drops can be used to treat minor infections. If the corneal infections are severe, prescription antibiotic treatment will be needed. Steroid eye drops may also be used to reduce the inflammation. But seeking an ophthalmologist's help is most important.