What is visual display terminal syndrome and how is it caused? Visual display terminals, including computer displays, televisions, game consoles, etc., are now widely used in various workplaces and social life areas. With the widespread popularity of TV and computer technology, people have more and more opportunities to contact with TV screens and terminal displays, and the number of people watching TV has reached nearly 800 million every day worldwide, while the average number of people using visual display terminals at work exceeds 30 million every day. VDT syndrome.
The causes of VDT syndrome include.
1, computer fluorescent screen electromagnetic waves, harsh colors and infrared rays can also stimulate the eyes, causing eye dryness, fatigue, double vision, blurred vision.
2, the bright light of the terminal screen glare stimulation and screen flicker jump, causing frequent eye rotation and excessive tension in the operation.
3.Insufficient blinking when using the computer. Because when people look at the fluorescent screen, the number of blinks of the eyes will be invisibly reduced, from 20-25 blinks per minute, to 5-10, thus reducing the secretion of tears. At the same time the eye is exposed to the air for a long time, so that the water evaporates too quickly, causing dry eyes discomfort, long-term so it is easy to cause dry eye disease, corneal epithelial detachment.
4, the impact of the work environment, the operation of full concentration, sitting, straight back, elbows and knees are 90 degrees flexed mandatory posture. Desk and chair type, height, and ergonomics of matching problems
Clinical manifestations.
Sense of visual fatigue, difficulty concentrating, pseudomyopia, conjunctival keratitis, elevated intraocular pressure, dry eye, VEP abnormalities, decreased contrast sensitivity, and reduced stereo visual function
Shoulder and neck pain, back pain, depression, autonomic disorders
How to prevent and manage VDT syndrome?
1, vision correction and use of glasses: visual fatigue and visual discomfort are mostly caused by my visual defects, if not corrected, the result is often worse vision or increased fatigue. The most common visual correction method is to wear a suitable monofocal lens, while older people can choose multifocal glasses. Correction is an effective method of clinical treatment for visual fatigue with insufficient adjustment or collection function.
2, pay attention to frequent and complete blinking action: avoid airflow blowing over the seat, and place tea near the seat to increase the surrounding humidity.
3, children who use computers for a long time: more likely to cause refractive changes without being aware of it, should pay more attention to the environment and time of children using computers at home.
4, pay attention to the combination of work and rest to prevent tendon strain: prolonged operation of the computer will lead to finger joints, wrists, arm muscles, shoulders, neck, back and other parts of the soreness and pain, so the operator should rest for 10 minutes after an hour of work, or do interval exercises.
5, to pay attention to eye hygiene: the distance between the eyes and the manuscript, eyes and screen should be kept at more than 50 cm, preferably using a light down view of 15 to 20 degrees. When working, should apply anti-radiation skin care oil on the face and hands.
6, long-term computer operators: should eat more fresh vegetables and fruits. Also increase the intake of vitamin A, B1, C and E. To prevent dry cornea, dry eyes, vision loss, and even night blindness, computer operators should eat more foods rich in vitamin A, such as soy products, fish, milk, walnuts, green vegetables, cabbage, tomatoes, hollow vegetables and fresh fruit. Vitamin C can effectively inhibit cell oxidation. The main role of vitamin E is to: lower cholesterol, remove waste from the body and prevent cataracts. Walnuts and peanuts are rich in vitamin E. Vitamin B1 can strengthen the nutrition of nerve cells and relieve the tension of nerves.
7, make some green tea every day: tea in the lipopolysaccharide, can improve the body’s hematopoietic function. After the body injected lipopolysaccharide, in a short period of time can enhance the body’s non-specific immunity. Tea can also prevent radiation damage.
8, to avoid fluorescent screen reflection or unclear: the computer should not be placed on the opposite side or back of the window; ambient lighting to be soft, if the operator behind the window should be drawn curtains to avoid bright light directly to the screen reflecting the bright image caused by eye fatigue.
9, the computer room to frequent ventilation: install ventilation fans or air conditioning in the room, the density of dust near the computer room is hundreds of times higher than the other spaces, they are attached to the human skin for a long time, can lead to various skin diseases. Computer rooms should be kept clean and sanitary, computers should be scrubbed regularly.
10, blink: the average person blinks less than 5 times per minute will make the eyes dry. A person blinks only one-third of the usual number of times when working on a computer, thus reducing the secretion of intraocular lubricants and enzymes. You should blink more often, and let your eyes rest at least once every hour.
11, lenses, sitting posture: people over 40 years old, it is best to use bifocal, multifocal lenses, or when typing, wear glasses with a lower prescription. Work posture and distance is also very important, try to maintain a distance of more than 60 cm, adjust a most appropriate posture, so that the line of sight can be maintained down about thirty degrees, such an angle can make the neck muscles relax, and make the eye surface exposed to the air to minimize the area.
12. The luminosity and clarity of the screen: whether it is appropriate, whether the light of the environment is soft, whether the height of the table and chairs and the comfort level can match the height of the terminal, these are the elements that must be considered.