Visual fatigue is mostly manifested as blurred vision, dry eyes, not wanting to open the eyes, headache, etc. Long hours, close work and overload of the eyes will cause the symptoms of visual fatigue. There are many causes of visual fatigue, which can be divided into physiological factors, psychological factors and environmental factors. Physiological factors: young people with high hyperopia, high astigmatism and refractive error are more prone to visual fatigue due to their own eye structure; in the early stage of presbyopia, the regulating ability of the eyes declines, and prolonged close eye use is prone to visual fatigue; there are also some pathological visual fatigue, mainly referring to the eye disease itself that causes blurred vision causing excessive regulation, such as glaucoma, uveitis, dry eye, etc. Psychological factors: Some patients do not have organic lesions, complaining of the symptoms of visual fatigue, feeling dry and blurred eyes, and also accompanied by headache, and no problems are found after the examination, usually after taking psychological treatment, the patient’s visual fatigue symptoms will be relieved. Environmental factors: environmental causes of visual fatigue are most common in life, with the improvement of living conditions and technological advances, air conditioning room caused by the lack of air circulation, rapid evaporation of moisture, long hours of concentration on the computer screen, the surface of the eye is easy to dry, resulting in visual fatigue. There are also in the bumpy environment or too much difference between light and dark environment, if excessive eye use will also produce visual fatigue. Then there is the popularity of video terminals, the vast majority of people go to work to look at the computer, after work to look at the phone, the eyes do not get enough rest, causing visual fatigue. To sum up, whether it is a long time close work or eye regulation ability decline, with the eye load increased, will cause visual fatigue.