Red eye is mainly transmitted by contact (contact with the patient’s eye secretions), not by respiratory transmission. Acute or subacute infectious conjunctivitis, commonly known as “pink eye”, is an infectious disease caused by pathogenic microorganisms, and is therefore contagious and highly infectious, mostly in the spring and autumn, and can be disseminated, but also in schools, factories and other collective living places. Its onset is rapid, incubation period is generally 1-3 days, two eyes at the same time or 1-2 days between the onset, the onset of 3 days to peak. The most common causative organisms are S. pneumoniae, S. aureus and Haemophilus influenzae, and the pathogen varies with the season. Although the causative organisms are different, they can be transmitted through various contacts, mainly contact with the patient’s ocular secretions, most commonly conjunctivitis from direct contact with patients with infectious conjunctivitis or their used objects (such as facial tissues, towels, etc.); actions such as rubbing or touching the eye when one eye is sick may lead to the other eye, which is the reason why red eye usually develops in both eyes. Other common infections are caused by eye secretions entering the pool during swimming. If a child is diagnosed with pink eye, he or she should stop going to school to prevent infection; if there are red-eye patients at home, washbasins and towels should be strictly separated and frequently disinfected by boiling. Therefore, the key to preventing pink eye is to control your hands and the water you use. Control “hands”, that is, wash your hands regularly, do not wipe your eyes with dirty hands; if your hands need to touch your eyes, you should first wash your hands with soap. Control the “water”, that is, do not let the contaminated water have the opportunity to contact the eyes, such as washing hands and face without a common towel and basin, in the red-eye epidemic not to swim in the pool.