No. 10 Accidental injury Natural or man-made disasters are unpredictable, and accidental impacts or injuries to the head or eyes may affect vision. For example, firecrackers, car accidents, fist blows to the eye, etc. The chances are relatively small and the damage is relatively large. No. 9 psychological factors This is a relatively easy to ignore a factor. Excessive stress and depression all have an effect on vision. Fear of wearing glasses, should not wear; desire to wear glasses, should not wear indiscriminately. All can affect vision. No. 8 Diet Good diet is the guarantee of a healthy body and healthy eyesight. The process of seeing things requires the participation of vitamin A. Optic nerve conduction in turn requires the help of vitamin B. Preventing old eyesight requires healthy blood vessels, for which vitamin C and vitamin E are helpful. In the absence of vitamin A, the eyes often feel dry, astringent, easily fatigued, and in severe cases the white surface of the eye is dry and wrinkled, even leading to corneal ulcers. No. 7 lesions drug poisoning eye diseases (pink eye, keratitis, cataracts, glaucoma, etc.) non-eye diseases (diabetes, cervical cone disease, hypertension, persistent fever, etc.) are likely to affect vision for a short or long time, and some drugs and viruses can also affect vision. Some drugs and viruses can also affect vision, including eye drops, which can also affect vision when used with dependence. Ageing of the eyes (macular degeneration, decreased density of cone cells, etc.) can also affect vision. Genetics The majority of myopia in preschoolers is genetic. Overall myopia is genetic in about 5% of cases. If both parents are highly myopic (800 degrees or more), the probability of the child getting myopia is very high. Therefore, experts recommend that the two parties with high myopia should not get married. No. 5 Eye hygiene Poor eye hygiene habits can have a profound effect on the eyes. This includes overworking, wiping eyes with dirty hands, reading in bed, etc. One bad habit is enough to ruin a pair of good eyes. No. 4 Environmental factors Many environments that we cannot personally change surround us. Unknowingly, the eyes are harmed. Including uneven reflection of the classroom blackboard, walls too bright, lighting too bright or too dark, tables and chairs are not suitable, etc., will directly and long time to affect our vision, silent. No. 3 watching TV into the top three! TV itself is a certain flickering luminous body, coupled with the distance is relatively close, long hours of watching TV, it is easier to produce fatigue, especially children and teenagers, easy to cause injury. No. 2 reading and writing runner-up came out! Reading and writing, are close to the fine visual completion, relying mainly on the visual cone cells. Excessive fatigue of the visual cells will bring about fatigue of the entire visual system, eye muscles, eye balls, etc. will undergo corresponding pathological changes. No.1 Using computer The champion is proud to appear! We can hardly study, work, live and play without the computer. It is a proximity luminescence. As the most frequent tool for our eyes at close range, the computer is also the source of the greatest fatigue to the eyes. Survey shows that 82.4% of computer users suffer from computer vision syndrome. This is characterized by dry and swollen eyes, reduced vision, and dizziness and neck pain. In the United States, this is ranked first as an occupational disease! Therefore, to slow down the eye fatigue of computer use, should also be placed in the first place of our human eye care!