”Red eye, also known as acute catarrhal conjunctivitis, is a common name for acute or subacute bacterial conjunctivitis. The conjunctiva is commonly known as the “white eyeball”, and in conjunctivitis the conjunctiva becomes congested so that the “white eyeball” has a red appearance, hence the name red eye. The most common pathogens are S. pneumoniae, S. aureus and Haemophilus influenzae. The pathogens can vary with the seasons (e.g., S. pneumoniae conjunctivitis is most often seen in winter). Clinical characteristics The onset of the disease is rapid, with both eyes developing at the same time or 1 to 2 days apart. The disease peaks at 3 to 4 days after onset, and the duration of the disease is usually less than 3 weeks. In the early stage of the disease, the patient feels a burning sensation and foreign body sensation, and then wakes up in the morning with discharge from the lid margin, redness and swelling of the eyelids, redness of the eyes, and a lot of discharge (the discharge is thin in the early stage and gradually becomes mucous and purulent as the disease progresses; because the discharge is sticky, it often sticks to the upper and lower eyelashes and makes it difficult to open the eyes in the morning). Vision is generally unaffected, but if the inflammation involves the cornea, it can cause symptoms of keratitis such as photophobia, lacrimation, and decreased vision. Occasionally, there is eyelid edema, and the clinical features of pink eye vary between pathogenic bacteria. For example, S. pneumoniae conjunctivitis is self-limiting, with a higher incidence in children than in adults, and can have upper whistle symptoms, but rarely causes pneumonia; Staphylococcal conjunctivitis, with blepharitis, can develop at any age, with difficulty opening the eyes in the morning due to mucopurulent secretions that char the eyelids, and less often involves the cornea. The principle of treatment is to remove the cause of the disease and anti-infective treatment. 1, local treatment: local antibiotic eye drops and eye ointment. The acute stage is once every 1 to 2 hours. At present, broad-spectrum aminoglycosides or quinolones are often used (such as tobramycin eye drops, ofloxacin eye drops, etc.); 2, systemic treatment: the old, young, weak, serious or accompanied by systemic symptoms, systemic medication can be given; 3, secretions: rinse the conjunctival sac with saline or swab with a wet cotton swab to remove secretions before medication (rinse to avoid the flow of rinse solution into the healthy eye dye); 4, if the inflammation involves the cornea If the inflammation involves the cornea, it should be treated according to the principles of keratitis treatment. If you do not wash your hands and touch your own eyes directly or indirectly after touching the secretions of the patient’s eyes, you may be infected. For example, if you rub the affected eye without washing your hands and then touch the eye directly or if the eye drops that you ordered to the affected eye flow into the eye, it can lead to the infection of the eye. Prevention Strict attention should be paid to personal hygiene, advocating the need to wash hands and face regularly, not to use hands and sleeves to wipe eyes, and not to share toiletries with others. Avoid contact with the patient’s tears and secretions, and isolate the patient and the used toiletries in the acute stage.