Dry eye, also known as conjunctival dryness, is a very common ocular surface disorder. It is defined medically as a general term for a group of diseases characterized by qualitative and quantitative, or kinetic, abnormalities of the tear fluid from a variety of causes, leading to tear film instability and ocular surface tissue lesions, accompanied by symptoms of ocular discomfort. In other words, this disease is caused by abnormalities in our tears. Our eyes are like a pool of water, in which there should not be more or less water, and the quality of the water should be up to standard. If there is less water, you will see things blurred, eyes afraid of light, pain, burning sensation and foreign body sensation. And these can feel uncomfortable, which is the dry eye disease manifestation. So why is there less water in the pool? This is the reason for the onset of dry eye, there are no more than three possibilities: 1, the pool intake pipe into the amount of water is less. 2, drain pipe drainage too fast. 3, the pool surface Evaporation is too fast. It is not difficult to understand, if the tears secreted less, outflow faster, or evaporate faster, will cause dry eye. Dry eye syndrome is mostly seen in middle-aged and elderly female patients, and is very much related to menopause and endocrine disorders. In recent years, with the widespread use of computers, the incidence of adolescents is also on the rise, especially the office population has become a high incidence of dry eye. In addition, environmental factors, ultraviolet radiation, various social pressures increase, etc., all have a great role in contributing to the occurrence of this disease. Prevention of this disease should pay attention to the following points: 1, pay attention to mental relaxation, keep in a good mood, feel tired eyes to rest properly. 2, will be placed in the television or computer below the eye level line of sight position, and watching television or using the computer time should not be too long, desk, computer monitor placed in the place not subject to direct sunlight. 3, long-term computer operation people should pay attention to diet, should eat more soy products, fish, milk, walnuts, cabbage, cabbage, tomatoes and fresh fruit. 4, found that eye discomfort, can preventive use of artificial tears, such as aggravation should be promptly go to the ophthalmology consultation. Don’t be alarmed if you suffer from dry eyes, go to the hospital in time and ask the doctor to prescribe the right medicine. If it is due to take some drugs caused by dry eye, to stop using drugs; if it is immune diseases, endocrine disorders, vitamin deficiencies, etc., you should first treat these diseases. If the dry eyes are caused by inappropriate glasses or contact lenses, they can be reconfigured according to the prescription from the ophthalmologist. If dry eyes are caused by overuse of the eyes, it is time to take rest.