”Red eye”, often referred to as acute bacterial conjunctivitis or acute viral conjunctivitis, is an inflammation of the conjunctiva caused by bacterial or viral infection of the conjunctiva. When the onset of the disease, the conjunctiva of both eyes is congested, the white eyeball is red, commonly known as “red eye”, as follows: “red eye” common clinical manifestations: the onset of the disease is more acute, more than two eyes onset (usually one eye onset early, the other eye onset time later). In the early stage of the disease, the patient feels burning, photophobia and foreign body sensation in both eyes, followed by redness and swelling of the eyelids, redness of the eyes, and a lot of secretions (conjunctival secretions are also known as eye droppings and eye mucus; bacterial secretions are yellowish-white mucous-purulent secretions, and in the morning when they wake up, the eyelids are sometimes burnt by the secretions, so it is not easy to open them. (Viral conjunctivitis discharge is relatively thin); some patients may also have small bleeding spots or hemorrhagic spots on the conjunctiva; if the inflammation involves the cornea (punctate infiltration of the cornea) will cause the corresponding symptoms of keratitis, such as photophobia, lacrimation, vision loss, etc.. Severe cases may be accompanied by headache, fever, malaise, and enlarged lymph nodes in front of the ear. Acute bacterial conjunctivitis or acute viral conjunctivitis is highly contagious and can spread the infection, which can be in collective living places such as schools and factories. The disease can be transmitted by contact. Patients themselves should try to avoid contact with their own tears and secretions, wash their hands frequently (especially before and after ordering eye medication), and pay attention to isolation from family members to reduce the spread of infection.