Dry eyes can be caused by environmental factors, excessive eye use or dry eye syndrome. 1. Environmental factors: the weather is drier in the fall and winter seasons, the tear evaporation rate of the eye surface will be faster, which can’t play a protective role for the eyes, and will cause dry eyes. 2. Excessive use of eyes: If you work in front of the computer for a long time, or watch TV for a long time, play the cell phone, etc., it is easy to lead to excessive use of eyes, eye fatigue, dryness, tearing and other symptoms of discomfort. 3. Dry eyes: usually related to the patient’s environment, daily eye habits, poor rest and other reasons, the patient’s tear gland secretion of liquid decreased, the quality of the decline, resulting in the eye surface does not get enough lubrication and thus dry eyes. If the discomfort of dry eyes cannot be improved after resting for a long time, it is recommended to go to the hospital as soon as possible for a complete examination to clarify the cause of the disease and then give targeted treatment or therapy. Daily attention should be paid to controlling the time of eye use and maintaining adequate sleep.