1, fatigue symptoms caused by excessive eye load: eye acidity, eye swelling, blurred vision, unstable vision, visual distortion, eyelid heaviness and other symptoms of visual fatigue. Most of these symptoms occur due to prolonged close eye use, local muscle overload. When the human eye looks at the screen, in order to obtain clear and effective vision, the muscles inside and outside the eye need to maintain a certain tension, and constantly do fine adjustment and convergence adjustment, in order to ensure that the line of sight always follow the target. When the eye movement load increases, if not timely rest and relaxation, can cause eye muscle (especially ciliary muscle) fatigue. 2, dry eye symptoms: It is currently believed that a large part of the symptoms of CVS, such as dry eyes, eye stinging, photophobia, tearing, and frequent blinking, are a reflection of dry eye surface. When the video terminal is working, the frequency of autonomous blinking is significantly reduced, and the eye is exposed to air for a long time, causing water to evaporate too quickly, plus the eye is looking upward, the gaze angle is increased, the lid fissure must be opened wide, the exposed area of the cornea is increased, and the evaporation of tears is increased, both of which together promote the occurrence of dry eye symptoms. When the monitor is placed too high, the eye surface exposure area increases to become a key factor in the occurrence of dry eye symptoms. 3, other symptoms: neurasthenia syndrome (dizziness, dizziness or headache, loss of eyes or nightmares, memory loss, hair loss, etc.), shoulder, neck and wrist syndrome (numbness, abnormal sensation and tremor, pressure pain, but also low back and small back pain discomfort), susceptible to colds and flu. Most of the clinical symptoms are functional changes and can return to normal after rest.