Dry eyes can be caused by dry eye syndrome, chronic conjunctivitis, lid gland dysfunction and other factors. 1. Dry eye: Dry eye is the eye discomfort caused by tear film instability and eye surface damage, due to insufficient tear secretion or excessive evaporation may cause dry eyes, accompanied by eye fatigue and foreign body sensation, may also cause eye pain and photophobia. 2. Chronic conjunctivitis: Chronic conjunctivitis is caused by a variety of factors, such as bacterial infection, acute conjunctivitis treatment is incomplete, poor working and living environment, air pollution. Local factors such as chronic dacryocystitis, blepharitis, blepharitis, lid entropion, ectropion, refractive error, occult strabismus, etc., can also lead to foreign body sensation, dry eyes, eye fatigue and so on. 3. Blepharoplakia: Blepharoplakia can cause a relative decrease in the composition of tears, affecting the stability of the tear film, and a decrease in tear secretion can also cause dryness. Dry eyes need to go to the eye hospital, the doctor will be based on clinical symptoms combined with routine examination to determine the cause of the disease, to take targeted treatment to improve the symptoms.