The common causes of dry eyes include visual fatigue and dry eye syndrome. 1. Visual fatigue: Poor rest, prolonged exposure to electronic products, excessive use of eyes, and use of glasses with inconsistent prescription can lead to visual fatigue, causing dry eyes, which can be relieved after rest. 2. Dry eye: it refers to any cause of abnormal tear quality or quantity or abnormal kinetics. Common symptoms include dry eyes, easy fatigue, itchy eyes, foreign body sensation and eye pain. Symptoms can be relieved with the use of artificial tears such as sodium vitrate drops under the supervision of a doctor. There may be other causes of dry eyes and drowsiness. If the symptoms are not relieved after resting, it is recommended to go to the hospital in time to clarify the cause of the disease and follow the doctor’s instructions for treatment.