Frequent dry eyes are usually caused by several reasons: 1. It is triggered by too little tear secretion from the eye, usually seen in the elderly, and is due to insufficient tear secretion caused by degeneration of glandular function. In this case, the tear secretion test will usually be less than 5 mm per 5 minutes. 2. It is caused by too strong tear volatilization in the eye, such as thyroid-related eye disease, occupational disease in the orbit, resulting in protruding eyeballs and incomplete lid closure, which will make the tear volatilization on the eye surface too strong, in addition to too little lipid in the tear composition will also lead to too strong tear volatilization. 3. It is caused by too little mucin in the tear composition, which leads to tear 4. The fatigue caused by excessive eye use, especially staring at an electronic screen for a long time, is the most likely cause.