Keratitis is an inflammatory reaction caused by a weakened corneal defense and an attack on the corneal tissue by external pathogens or self-inflicted diseases, and patients commonly have symptoms of corneal irritation and intraocular tissue symptoms. The principle of keratitis medication is to control the infection, reduce the inflammatory response, and promote ulcer healing to prevent perforation, which usually requires different anti-infective drugs for different pathogens, and can be used in the form of local and systemic medication for the eye. I. Symptoms: 1. Corneal irritation symptoms: common symptoms in patients include eye pain, photophobia, tearing, foreign body sensation, eyelid spasm and other conjunctival irritation symptoms, and are accompanied by varying degrees of vision loss, which can last until the inflammation subsides. In the case of purulent keratitis, the patient will have purulent discharge of different nature in addition to the purulent corneal lesions; 2. Intraocular tissue symptoms: Patients with keratitis will also have certain inflammatory conditions in the eye, such as iridocyclitis, atrial clouding, anterior chamber pus accumulation, pupil narrowing, and post-iris adhesions. Second, medication: 1, bacterial infection: patients can apply antibiotic eye drops, antibiotic eye ointment treatment, commonly used drugs include levofloxacin eye drops, tobramycin eye drops, aureomycin hydrochloride eye ointment, and oxyfloxacin eye ointment. Patients with bacterial keratitis in the acute phase, generally do not apply glucocorticoid eye drops, such as tobramycin dexamethasone eye drops, etc., while the chronic phase can use hormonal eye drops, such as dexamethasone eye drops, etc., as appropriate; 2, viral infection: patients need to use antiviral eye drops, eye ointment for treatment, commonly used drugs include interferon eye drops, acyclovir eye drops, ganciclovir eye gel, etc. Herpes simplex keratitis patients who use hormones can only be used for non-ulcer type keratoconjunctivitis. When keratitis is complicated by iridocyclitis, you can use atropine eye gel etc. to dilate the pupil and reduce the inflammatory response; 3, fungal infection: patients need to be treated with antifungal drops, commonly used drugs include amphotericin B eye drops, natamycin eye drops, etc. The use of glucocorticoids is generally prohibited 4, immune causes: patients need to use anti-inflammatory drugs for treatment, such as immunosuppressants, commonly used immune agents include cyclosporine eye drops, tacrolimus eye drops, etc., but when the corneal epithelium is incomplete, hormonal eye drops should be used with caution. Patients with keratitis should seek prompt medical attention to clarify the cause of the disease before treating it symptomatically, and symptoms can usually be improved with the application of topical medications. If the patient’s symptoms are more serious, systemic medication can be used under the guidance of a doctor, depending on the physical condition, such as oral fluconazole, cephalexin, etc. If medication is ineffective, surgical treatment can also be considered.