Read books to learn such things for us is how commonplace things, but you know how to read books correctly eyes will not easily fatigue? Now teach you a few tricks: our eyes to see the outside world objects, two factors must have. First, the surface of the object to be seen to have enough brightness. If the light is not good and the brightness is not enough, the object cannot be seen clearly. Secondly, the eyeballs, visual paths and visual centers must be free from physical defects and function normally. The latter factor has been talked about a lot, now we say how to improve the eye environment. First, the appropriate brightness of the light is the most basic conditions to cause vision. This light is not a smooth mirror reflection of the glare, but the object performance of the diffuse, uniform and consistent reflection, that is, the brightness of the object surface. To achieve a clear, comfortable, long-lasting look to prevent visual fatigue and get the best visual effect, the brightness of the object to be seen increased to the appropriate level, is very important, should pay attention to. Children learn the near environment lighting lighting requirements are: (1) school classrooms and homework room, natural light, window light transmission area and room area ratio of not less than 1:6. light into the direction of the input should be from the left side of the input, not from the front or right side of the light. Prevent reading and writing under direct sunlight. When lighting with artificial light, the greater the contrast between the brightness of the indoor environment and that of the work surface of the book, the easier it is to cause visual fatigue. If you read in a dark room with only a desk lamp on, your eyes get tired quickly. So when studying in addition to desk lamp lighting, the room should also open a small light, in order to reduce the difference between indoor light and darkness. Desktop and book illumination and visual effect is proportional to the stronger lighting, vision accordingly, but too much light is also easy to vision fatigue. Life is often insufficient lighting, illumination does not meet the requirements. Incandescent lamps compared with fluorescent lamps, incandescent lamps are a warm light source, light is soft and stable, the color temperature is close to the natural light, in this light environment, learning, eye fatigue is not easy. Study the best lighting degree of 200 lux (Lux), for which the incandescent lamp should be at least 40W above, the left side of the light source from the desktop 30 cm is appropriate, 60W, not more than 50 cm. (2) Avoid reading and writing in a glare environment. Eyes looking directly at any light source produces glare damage, so in close work, the light source can not shine directly into the eyes, not to mention reading and writing in the sun. Can reflective blackboard, desktop and white paper, can increase the reflected glare. Second, the appropriate contrast brightness contrast is high, clear vision and not easy to fatigue. Children use books, classroom blackboards, etc., if the degree of black and white is very low, the paper is not white enough and the ink is not black enough, the brightness contrast is reduced to see such words is very difficult, in order to see clearly, we must move the book closer. The eyes will also use more regulation, and eye fatigue and myopia are bound to worsen. When choosing teaching materials, books, and reading materials for children, it is important to choose varieties with good quality printing paper and printing, especially those with colorful printing and large fonts to protect children’s eyes. Blackboards for school use should be kept non-reflective black or dark green to avoid direct sunlight on the blackboard. Third, to prevent eye fatigue study time should not be too long, a 40-minute appropriate. Take a 10-minute break to look at distant objects and do eye exercises.