Red eye is generally referred to as acute conjunctivitis. Acute conjunctivitis is mostly transmitted by contact, i.e., if a person directly or indirectly touches his or her own eyes without washing his or her hands after lifting the secretions from the patient’s eyes, he or she may be infected. For example, if one eye has pink eye, the other eye is often infected, possibly because the patient did not wash his hands after rubbing the affected eye and then directly contacted the healthy eye, resulting in the healthy eye being infected; it is also possible that when washing the face, microorganisms are indirectly infected through the water to the healthy eye; it is also possible that the eye drops that are ordered to the affected eye flow to the healthy eye, resulting in the healthy eye being infected. Therefore, it is recommended to wash hands and face frequently and not to wipe eyes with hands and sleeves. Patients with infectious conjunctivitis should be isolated, and the toiletries used by patients must be isolated and disinfected. Medical personnel should wash their hands and disinfect after examining patients to prevent cross-infection. Conduct hygiene promotion, regular inspection and strengthen management for places where people are concentrated, such as barber stores, restaurants, factories, schools, childcare centers and swimming pools.