The causes of chronic conjunctivitis include bacterial infection, environmental stimuli and bad habits, etc. Patients can take appropriate measures according to their own situation. 1. Bacterial infection: chronic conjunctivitis may be caused by eye infection with streptococcus or other bacteria, usually caused by acute bacterial infections that do not heal, patients can follow the doctor’s instructions to use antibiotic eye drops treatment, such as levofloxacin eye drops. 2. Environmental stimulation: If the patient is in a long-term stimulation of the eye in the environment, such as long-term exposure to strong light, dust or the use of drugs to stimulate the eye, may cause conjunctivitis, the patient needs to stay away from this environment. 3. Bad habits: if the patient long-term excessive use of electronic products or stay up late, may also cause chronic conjunctivitis, the patient needs to improve living habits, reduce the time to play electronic products. It is recommended that patients with chronic conjunctivitis consult a doctor to assess their condition and follow the doctor’s instructions for treatment.