With the rapid development of science, computers have entered millions of households and become an indispensable tool for modern people’s working life. Frequent access to the Internet and prolonged stay in front of the screen make the eyes overwhelmed. Over time, a modern disease has developed – screen terminal syndrome, namely, visual fatigue, dry and itchy eyes, burning foreign body sensation, blurred vision, vision loss, eye swelling, orbital pain and other eye symptoms, may also be accompanied by headache, nausea, insomnia, hair loss, memory loss, loss of appetite, constipation, reduced immunity and shoulder This affects people’s physical and mental health and work quality. How can computer users avoid visual fatigue? Visual fatigue refers to a series of symptoms that occur when the eyes look at near objects for a long time, and used to be seen in writing, reading, sewing, carving, embroidery, watch repair and other fine eye use. Nowadays, with the popularity of computers, prolonged Internet access has become the most important cause of visual fatigue. At present, the peripheral symptoms such as eye drowsiness, burning sensation, foreign body sensation, dryness, tearing, eye redness, eye swelling or orbital soreness, as well as headache, reflex neck and shoulder back pain, general weakness, mental fatigue and nausea caused by prolonged near eye use are collectively referred to as visual fatigue syndrome. Among them, computer-related visual fatigue is also called VDT visual fatigue. For middle-aged and elderly people, if they have refractive error, presbyopia, strabismus and other eye diseases, and have not been reasonably corrected, or suffer from certain eye diseases (glaucoma, conjunctivitis, keratitis, etc.) and systemic diseases (cervical spondylosis, anxiety, neurasthenia, hypertension, malnutrition, etc.), the chances of visual fatigue are more. As computers gradually spread to offices and homes, penetrating into all areas of work, study and life, the prevalence of visual fatigue is also increasing geometrically. How can computer users avoid visual fatigue? As the text and images of the computer fluorescent screen are composed of countless tiny fluorescent dots, in order to ensure clear vision, the eyes must constantly adjust the focus, and over time, it will lead to eye regulation and other functional disorders. Older people, due to age, the physiological function of the eye gradually decline, excessive near eye use is more likely to occur after visual fatigue. In addition, some studies show that the number of eye blinks when looking at the computer is reduced from the usual 20-25 times per minute to 5-10 times per minute, so that the tears that lubricate the cornea and conjunctiva can not be timely and evenly spread on the surface of the eye, making the eye feel dry and uncomfortable, and even damage the corneal epithelium and affect vision. Furthermore, the computer keyboard is also a breeding ground for the spread of microorganisms, becoming a way to spread conjunctivitis, keratitis. Shared office equipment or home multi-person a machine, especially should pay attention to the cleanliness and hygiene of the keyboard and personal eye hygiene. Pay attention to the following points can be very good to avoid visual fatigue: 1, to avoid visual fatigue to pay attention to the operating sitting position and distance. When operating the computer, the distance between the eyes and the screen should be maintained at about 60 cm, the height of the seat to the line of sight can be down 30 ° gaze at the screen, the front elbow arm can rest flat on the keyboard as appropriate, because this angle is conducive to the relaxation of the neck, shoulders, back muscles. 2, wearing the right number of glasses to correct refractive error and presbyopia, because refractive error and presbyopia is the most important cause of visual fatigue. Do not buy presbyopic glasses at random on the road stalls, it is best to go to the hospital to fix the bifocal glasses suitable for use when operating a computer. 3, improve the quality of the screen and the surrounding environment can also relieve visual fatigue. Some computers have been used for too long, the screen screen quality and tone changes, resulting in a decline in clarity, can add attention to fatigue. At this time, the display should be replaced in a timely manner. In addition, the surrounding environment is too strong, too weak light or contrast with the screen brightness, noise interference, poor ventilation, etc., is also a factor causing visual fatigue, should pay attention to avoid. 4, in order to prevent visual fatigue or has a mild visual fatigue, can be appropriate drops of anti-fatigue eye drops, such as new Ladon eye drops, vitamin B12 eye drops, strong pearl eye drops. Prevent eye dryness with artificial tears eye water and R&S eye water. If symptoms of conjunctivitis appear, antibiotic eye drops must be used under the guidance of an ophthalmologist as appropriate. Do not use antibiotics or even hormone-containing eye drops on your own, otherwise, it will lead to new problems such as local resistance or disorders of the conjunctival capsule flora. 5, control the time to operate the computer. The appearance of visual fatigue and the degree of fatigue is closely related to the time spent operating the computer. The elderly should control the time because of the declining function of the eyes and the whole body. Time on the computer is generally 2-4 times a week, each time no more than 1-2 hours is appropriate. When you are on the computer for a period of time, you can close your eyes or look into the distance to give your eyes a rest, and you can also move your body.