Conjunctivitis is a common disease of the eye. Most of the conjunctiva is in direct contact with the outside world and is easily stimulated by infectious and non-infectious factors in the surrounding environment, and the conjunctiva is rich in vascular and lymphoid tissue, which can be easily sensitized by its own and external antigens. Symptoms and treatment of conjunctivitis vary according to the causative agent: 1. Bacterial conjunctivitis: The conjunctiva can appear significantly congested and can be accompanied by a significant increase in catarrhal or mucopurulent secretions. Patients with acute bacterial conjunctivitis can have large amounts of mucopurulent or purulent discharge from the eyelids when they get up in the morning. Vision is usually not affected and can cause the formation of a true or pseudomembrane on the conjunctival surface of the lid. If the disease is particularly severe or recurrent, the affected eye must not be bandaged for acute bacterial conjunctivitis. The main clinical treatment is the use of antibiotic eye drops, commonly used drugs include levofloxacin eye drops, tobramycin eye drops, and ofloxacin eye ointment. 2. Viral conjunctivitis: Patients usually present with eye congestion, eye pain, photophobia, with increased aqueous discharge, and other manifestations. In the acute stage, eyelid edema, conjunctival congestion and edema can be seen, and later the cornea can show diffuse patchy epithelial damage which affects vision. The main use of anti-viral drugs, including recombinant human interferon alpha 2b eye drops, acyclovir eye drops, ganciclovir eye ointment, etc.; 3, allergic conjunctivitis: the main symptoms of patients are eye itching, conjunctival congestion, lid conjunctival surface can be seen papillary hyperplasia, mucus-like, white filiform secretions increased and other characteristics. Mainly anti-allergic eye drops and anti-inflammatory eye drops, commonly used drugs mainly include olopatadine hydrochloride eye drops, sodium cromoglycate eye drops, emmetine fumarate eye drops, flumetron eye drops, pralophine eye drops, etc.; 4. Chlamydial conjunctivitis: caused by chlamydial infection, pain and swelling of the eye may occur, clinical use of neomycin, erythromycin or tetracycline eye drops or eye ointment, acute phase In acute or severe cases, systemic medications may be used. The medication for conjunctivitis often requires a combination of drugs, so if you have conjunctivitis you should go to the hospital and get a clear diagnosis before using the medication to avoid delays.