The cornea (Figure A) is commonly referred to as the “black eye”. The normal structure and function of the cornea is a prerequisite for clear vision. Keratitis (Figure B) can cause clouding of the cornea, resulting in vision loss. ab What is keratitis? Inflammation of corneal tissue caused by external or endogenous pathogenic factors is collectively referred to as keratitis. The most common clinical manifestations of keratitis are redness, eye pain, photophobia, tearing, and eyelid spasm (which may persist until the inflammation subsides); often accompanied by varying degrees of vision loss, more pronounced if the lesion is located in the central optical area; and septic keratitis, which is accompanied by purulent secretions of varying nature on the surface of the infiltrating foci in addition to purulent corneal necrotic lesions. Treatment of keratitis The principles of keratitis treatment are to actively control the infection, reduce the inflammatory response, promote ulcer healing, and reduce scar formation. Because of the different causes of keratitis, the specific treatment plan is different (for example, bacterial keratitis should be treated with sensitive antibiotics; antifungal drugs are an important means of treating fungal keratitis; and viral keratitis should be treated with antiviral drugs); clinically, the combination of drugs is mostly used to improve the efficacy, and systemic drugs can be used in severe cases; if corneal ulcers occur If there is a perforation of the cornea, the possibility of intraocular or systemic spread of inflammation, scleral suppuration or corneal infection secondary to corneal or scleral perforation injury, systemic medication should be given along with local medication; if the condition is complicated by iridocyclitis, pupil dilating medication and anti-inflammatory treatment should be given; for keratitis with serious condition, ineffective medication, imminent or already perforated cornea, surgical treatment should be given and postoperative treatment should be continued The medication should be continued after surgery. Note: The choice of medication for keratitis depends on the cause of the keratitis; the application of glucocorticoids requires strict indications (some types of keratitis can be used at the discretion of the patient, while others are prohibited), and improper use can cause deterioration or even perforation. Therefore, it is recommended that the treatment of patients with keratitis needs to be carried out under the guidance of a professional.