Dry eye is a group of diseases in which the tear film is unstable and the ocular surface is damaged due to abnormalities in the quantity or quality of tears, resulting in ocular discomfort symptoms. It is the most common ocular surface disorder. How to prevent dry eye? 1, pay attention to eye moisturizing is the best prevention method. To pay attention to eye habits, regular rest, continuous time in front of the computer screen should not be too long, every 1 hour to rest 5-10 minutes, as far as possible in the gap to let the eyes relax. Eyes are inward and downward looking, so when resting, try to let the eyes look to the upper left and upper right. One should also move the neck and shoulder muscles when resting, because stiff and disordered neck muscles can affect vision. Students should also pay attention to the dietary structure, take more vitamins A, C and D, and eat more carrots, fruits and seafood. Surveys have confirmed that 90% of people who work in front of a computer for more than 3 hours a day suffer from dry eyes. And in the next 5 years, the number of patients with dry eyes will rise at a rate of more than 10% per year. 2, wear contact lenses for a long time also easy to get dry eyes, this is because contact lenses are easy to adsorb water, which leads to dehydration of the surface of the eye. Dry eyes can not be cured, most of the clinical use of artificial tears to relieve symptoms. There are two types of artificial tears, aqueous and cream, and the artificial tears used vary in the severity of symptoms. Once you stop using it, the symptoms often return. 3, maintain good working and living habits is an effective means to prevent dry eyes. First of all, avoid operating computer for a long time and pay attention to the interval. Usually operate continuously for 1 hour and take a break for 5 to 10 minutes. When resting, you can look far away or do eye exercises. Secondly, we should adjust the distance and position of the monitor and eyes, it is recommended that the distance is 50 to 70 cm, the position is slightly lower than the eye level 10 to 20 cm, and the brightness of the monitor should not be too bright, adjust to half of the maximum brightness can be, to see the content clearly but slightly darker than the surrounding objects is appropriate. In addition, when using a computer for a long time, it is best not to wear contact lenses, so as not to exacerbate the dryness of the eyes. In addition, long-term computer operators, pay attention to dietary conditioning, should eat more soy products, fish, milk, walnuts, green vegetables, cabbage, hollow vegetables, tomatoes and fresh fruit. 4, daily life pay attention to eye care, can prevent dry eyes, if the onset of symptoms will also be reduced. The method is to use your eyes properly, pay attention to mental relaxation, and take appropriate rest when you feel eye fatigue. The TV set at home and the computer in the office should not be placed in a position higher than the eye level, because the eye level vision is not easy to fatigue, the loss of the eyes is small. Computers should preferably have anti-radiation screen protection. People at high risk of dry eyes who work in front of computers should always have eye drops and regular hydration to increase eye moistening and maintain normal function.