Keratitis is a relatively common ophthalmic disease. The causes of keratitis are multiple and can be endogenous or exogenous. The recovery time from keratitis is related to the cause and severity of the condition. The cornea is located in the front part of the eye. When its resistance is reduced and it is stimulated by endogenous or exogenous factors, an inflammatory reaction may occur, mainly manifesting as photophobia, vision loss, tearing, and eye pain. If keratitis is due to a bacterial, viral or fungal infection, the symptoms are mild and can usually be cured in about 14 days with treatment under the guidance of an ophthalmologist. If the keratitis symptoms are more severe, with localized perforation, recovery is difficult at this point and sometimes even a corneal transplant is required. If the keratitis is caused by an autoimmune disease, the keratitis will heal when the autoimmune disease is controlled. Keratitis should be treated aggressively to avoid scarring that can affect vision, avoid excessive eye use during treatment, and pay attention to rest.