The difference between conjunctivitis and keratitis mainly lies in the site of onset, clinical manifestations, treatment, etc., the specific diagnosis and treatment should follow the doctor’s instructions. 1. Site: Conjunctivitis is an inflammatory disease that occurs in the conjunctiva (a layer of mucous membrane that covers the eyelid and the front of the eyeball, commonly referred to as the “white eye”); keratitis is an inflammatory disease that occurs in the cornea (the transparent part of the outer front part of the eyeball wall, commonly referred to as the “black eye”). Keratitis is an inflammatory disease of the cornea (the transparent outer front part of the eye wall, commonly referred to as the “black eye”). 2. Clinical manifestations: Conjunctivitis is characterized by symptoms of irritation such as photophobia and increased secretions, which may be accompanied by ocular signs such as conjunctival congestion and edema, and complications such as swollen lymph nodes in front of the ear in some patients; Keratitis, in addition to the above symptoms of ocular irritation, is usually associated with vision loss of varying severity, and complications such as secondary glaucoma, corneal neovascularization, and so on. 3. Treatment: Conjunctivitis is mainly treated with topical medication; keratitis is not only treated with medication, but also with surgical methods such as corneal transplantation and corrective surgery, which is suitable for cases such as ineffective medication and perforated corneal ulcers. In summary, the specific diagnosis and treatment of the two diseases must be completed by a professional doctor, do not blindly judge, dispose of yourself, in order to avoid improper intervention, resulting in adverse consequences.