Keratitis is a common disease of the eye and is currently the second most common blindness-causing eye disease worldwide. Keratitis causes vision loss mainly by leaving white spots on the cornea, thus blocking light. Treatment should be based on the severity of the corneal white spots to take different options: 1. For corneal infections that are still not effectively controlled, the type of pathogen causing the infection needs to be identified and then promptly treated with anti-infection. For example, bacterial infection can be treated with norfloxacin eye drops and viral infection can be treated with recombinant human interferon alpha 2b eye drops to bring the infection under control. 2. In the early stage of corneal leukoplakia formation when the infection is effectively controlled, hormonal drugs are needed to suppress corneal leukoplakia, for example, prednisolone acetate eye drops can be ordered. 3. In the advanced stage of the disease when the cornea has formed large dense leukoplakia, it can only be treated by corneal transplantation. The cornea can only be treated by corneal transplantation.