1.What is video terminal syndrome? A: Video terminal syndrome, also known as “computer terminal syndrome”, refers to a group of non-characteristic symptoms that occur due to prolonged operation in front of the video terminal and gazing at the fluorescent screen, including neurasthenia syndrome (headache, dizziness, forehead pressure, nausea, insomnia or nightmares, memory loss, hair loss, etc.), shoulder, neck and wrist syndrome (numbness (numbness, abnormal sensation and tremor, pressure pain and back pain), eye symptoms (visual fatigue, dry eyes, eye itching, burning foreign body sensation, blurred vision, decreased vision, eye distension, orbital pain, etc.), and loss of appetite, constipation, decreased resistance, etc., and even certain effects on the endocrine system. 2.What are the hazards of video terminal syndrome? A: There are mainly the following hazards: vision loss: continuous operation for more than 2 h can cause vision loss, but after 30 min rest, vision can be restored to normal level. Therefore, this stage of fatigue does not pose a threat to vision, but the accumulation to a certain extent, it can lead to vision loss. Myopia aggravation: frequent computer operators have a higher incidence of myopia, and will gradually increase the degree of myopia. Causes dry eye: operation, the number of transients reduced, so the role of the eyelids through the uniform distribution of tears on the surface of the cornea to reduce the function of tear evaporation increased, coupled with the user is mostly in an air-conditioned environment, the relative humidity in the room is low, which aggravates the evaporation of tears, the patient can appear dry eye discomfort, serious cases can occur keratitis or conjunctivitis. Dry eye can also lead to decreased visual quality and frequent wavefront image differences due to the unevenness of the tear film on the eye surface. Neck, shoulder and wrist dysfunction: Patients with VDT syndrome often tap their fingers on the keyboard, resulting in stiffness and soreness of the fingers and wrist joints. The fixed posture of sitting with head down and reading words for a long time also causes discomfort and pain in the neck and lower back. Mental fatigue: long-term fixed posture work, will make people feel monotonous and boring. Some have symptoms such as irritability and inferior emotions. 3.How to prevent video terminal syndrome? A: The main preventive measures are: Do not stare at the screen for a long time Know that people in general blink about 20 times a minute, when using the computer work due to the gaze, the number of blinks per minute reduced to 6 times. In this case, if you use your eyes excessively, it will lead to a reduction in tear secretion and deterioration of the tear component, which will lead to dry eye disease, dry eye surface, conjunctival congestion, easy damage to the cornea, eye discomfort, burning and foreign body sensation in the eyes, grinding pain, etc., and blurred vision when looking at things. Correct posture, proper distance to maintain the correct posture and gaze distance when using the computer, too close or incorrect posture, too close to the computer screen, are more vulnerable to radiation. In the use of laptop computers, because the screen is too small, resulting in the user must work close, head forward, neck muscle force, it is easy to aggravate eye fatigue. Therefore, attention should be paid to adjust the working time, every 1 to 2 hours of work to rest 15 minutes, closed eyes or far-sighted. And the computer distance should be maintained at more than 60 cm, the line of sight down about 30 degrees. Keep the screen quality, clarity Some computers because of the use of too much time led to a reduction in screen quality, clarity, resulting in reading difficulties, to adjust or replace in a timely manner. The appropriate environment is also important The light in the environment is too strong or too weak will lead to a strong reaction between the screen and the outside world, easy to cause eye irritation, so the environment should be soft light. The computer should not be placed against the wall, otherwise not only vulnerable to moisture attacks, and the user looks up into the eyes is a wall, the eyes in this case not only can not get a good adjustment and relaxation, but also increase the tension and fatigue of the optic nerve. So the computer is best placed in the window, or let the distance between the screen and the wall in more than 1 meter. Or on the wall behind the computer to paste some green or blue paintings (such as forests or the sea), can effectively relieve anxiety and fatigue symptoms.