Wearing contact lenses can easily cause conjunctivitis, while ordinary eyeglasses usually do not cause conjunctivitis. Conjunctivitis is mainly due to infected microorganisms, physical stimulation, and so on. 1. Infected microorganisms: bacteria such as pneumococcus, staphylococcus aureus, gonococcus, etc., viruses such as human adenovirus, microRNA virus, etc., and sometimes rickettsiae, parasitic infections. If contact lenses are not cleaned and cared for, direct contact with the eye structure when these microorganisms are present on the lenses can easily cause conjunctivitis in patients. 2. Physical irritation: When soot, ultraviolet rays, wind and sand enter the eyes directly, contact lenses tend to keep these substances in the eyes for a longer period of time, thus leading to conjunctivitis. 3. Chemical irritation: When the eyes come into contact with toxic gases, acids and alkalis, medical drugs, etc., it is easy to cause inflammation of the eyes and thus conjunctivitis. Patients usually need to pay attention to eye hygiene, keep glasses clean, reduce the chance of direct eye contact with other objects. It is recommended that patients who wear eyeglasses and develop conjunctivitis should seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.