It is divided into two categories: infectious and non-infectious. The former is inflammation caused by pathogenic microorganisms, bacteria, viruses, chlamydia, fungi, etc. may cause disease. It is usually treated with antibiotic eye drops such as chloramphenicol and rifampin.

The occurrence of non-infectious chronic conjunctivitis is mainly related to the environment and eye habits. With the improvement of hygiene, the incidence of infectious conjunctivitis is gradually decreasing, while the number of cases of non-infectious chronic conjunctivitis is increasing. This is because the causes of non-infectious chronic conjunctivitis are dominated by poor environment and lifestyle, including: irritation from sand, dust, smoke, sunlight and harmful gases; frequent late nights, lack of sleep, excessive smoking and eye fatigue. Especially long time operation of the computer or the Internet is harmful to the eyes, on the one hand, computer visual fatigue syndrome can cause conjunctivitis symptoms; on the other hand, computer-induced dry eye can also cause or aggravate conjunctivitis. Long-term use of certain cosmetics or eye medications is also a cause. In addition, chronic rhinitis, allergic state, original eye diseases, such as inverted eyelashes, blepharitis, chronic dacryocystitis, blepharoplasty obstruction, etc., uncorrected refractive errors, strabismus, etc. can also cause chronic conjunctivitis. Note: For non-infectious chronic conjunctivitis, antibiotic ophthalmic drugs should never be abused, otherwise they are not only ineffective, but also prone to drug resistance, and even the formation of drug-induced conjunctivitis. Should find the cause of the disease before treatment, and then take corresponding measures, such as improving the work and living environment; personal hygiene; avoid eye fatigue; ensure adequate sleep; long-term outdoor workers are best to wear goggles; correct refractive errors and strabismus; active treatment of the patient's original eye disease. Itchy eyes and other symptoms are obvious, you can drop zinc sulfate eye drops 3-4 times a day to relieve the symptoms.