Discoid keratitis is an inflammation of the corneal stroma caused by an autoimmune reaction to a viral infection and requires a combination of antiviral eye drops and hormonal eye drops for treatment. Discoid keratitis occurs when the patient experiences significant loss of vision, tearing, photophobia, eye pain, etc. Slit lamp microscopy reveals disc-like cloudiness and edema in the corneal stroma, which can be diagnosed as discoid keratitis once the typical symptoms occur. Antiviral eye drops, such as ganciclovir eye drops and acyclovir eye drops are commonly used. Hormonal eye drops, such as flumetron eye drops, are also needed to rapidly eliminate the edema in the corneal stroma, and tobramycin dexamethasone eye drops and prednisolone acetate eye drops can be used at the same time.