Causes: Visual fatigue, dry eye: people in general blink about 20 times a minute, when using a computer, because too much attention, the number of blinks per minute reduced to 6 times, and constantly adjust the focus to ensure clear vision, long periods of high-intensity eye, coupled with the computer screen issued by the blue light and other electromagnetic radiation will seriously stimulate the eye, resulting in reduced tear secretion and component degeneration, and then become dry Eye disease, eye fatigue, corneal dryness, conjunctival congestion, blurred vision and other discomfort, accompanied by headaches and nausea and even mental symptoms in severe cases. Indoor temperature and humidity is also one of the causes. In general, in air-conditioned rooms, the moisture on the surface of the eye evaporates too quickly, which is very likely to lead to dry eye disease. In a closed environment, long-term non-ventilation, low air circulation, poor air quality, easy to cause microbial infection, aggravate dry eye symptoms, complicating conjunctival inflammation. Neck, shoulder, wrist and other dysfunctions: frequent finger tapping on the keyboard, resulting in stiff fingers and wrist joints and soreness and even tendinitis. Long-term sitting, head down, looking at the computer in a fixed position, which in turn can damage the neck and low back. Mental fatigue: long-term eye fixation and body fixed posture work, will make people feel monotonous and boring. Some symptoms such as irritability and inferior emotions. Preventive measures: 1. Reduce excessive eye use. For every 1 to 2 hours of work, take a 15-minute break, massage with eyes closed, watch greenery, blink consciously and frequently, get up and look far away and move the waist and neck. 2.Improve the working environment. Pay attention to adjusting indoor ventilation and maintaining the appropriate temperature and humidity. Adjust the monitor height (slightly lower than the eye) and distance (>40cm). 3. Wear protective glasses. Long-term computer near work (> 6 hours a day) need to reduce the original myopia (farsighted patients need to raise) and wear with anti-blue light and other electromagnetic radiation optical lenses. Especially -4.00 or more myopic patients should take extra precautions. 4, appropriate diet regimen. Eat some carrots, oranges, tomatoes, dates and other foods rich in vitamin A and vitamin B, which can reduce the consumption of retinal retinas and maintain eye nutrition. Drink more wolfberry tea, chrysanthemum tea, cassia seed tea and other teas as appropriate. 5, if necessary, hospital consultation. If long-term symptoms are not relieved, do not blindly apply eye drops, you must go through a professional optometric examination before symptomatic treatment.