1. Because after lying down, the contact area between the body and the supporting surface (such as bed) increases, the pressure decreases, and the human body is in a comfortable state, so the nerve center will make people sleepy, thus prompting the brain and body to rest (that is, sleep). At this time, people's brains are slow to respond and their memory is greatly reduced, which is very unfavorable for learning. Moreover, lying down to read books is easy to make eyes tired, and the elasticity of eye muscle fibers becomes smaller, which is easy to be nearsighted. In short, it is not good to read while lying down. First, the reading and writing posture should be correct, so as to achieve "three ones": First, when writing, the finger is one inch away from the pen tip. Some students are used to putting their fingers close to the pen tip when writing, so that their eyes can't see the font, their heads are tilted to one side, and the distance between their eyes and the book is inconsistent. After a long time, their eyesight will be inconsistent, leading to poor eyesight. Therefore, when writing, your fingers must be one inch away from the pen tip, your head should be straight, and your body should be in shape so that your eyesight will not be affected. Second, when reading and writing, the eyes are one foot away from the book: the physiological function of the eyes is this: the farther you look, the greater the adjustment of the eyeball. When reading and writing, the eyes are one foot away from the book, which already needs greater adjustment. If the distance between the eyes and the book is too close, the adjustment of the eyeball will be more tense, which often leads to eyeball fatigue. Third, keep a fist distance between the chest and the edge of the table: when writing, keep a fist distance between the chest and the edge of the table. Only in this way can you hold your chest out. If you bend over, the chest organs will be compressed, affecting breathing and blood circulation, thus affecting the growth and development of the body. In the long run, it will form a hunchback and the spine will bend abnormally. And it affects vision. Therefore, students must develop good reading and writing posture and achieve "three ones". There are many reasons for myopia. For example, some students, when reading a book, read it in one breath without rest, which often causes visual fatigue. Some students like to lie on the table or read in bed, so the distance between eyes and books is not very big, which will also cause poor eyesight. Some students turn on the TV and throw away their schoolbags as soon as they get home. They sit in front of the TV all day on holidays and are stimulated by TV rays for a long time, which is very harmful to their eyes. Partial eclipse, some students don't like to eat fish, and fish contains vitamin A, which can protect our eyesight, so we can't be partial eclipse. We eat what our parents do, so a balanced diet is conducive to the growth and development of the body. To sum up, eye hygiene should not only achieve correct reading and writing posture, but also achieve "three musts and three noes": First, when reading and writing, keep your eyes one foot away from the book; Second, read and write for about an hour, rest for a few minutes, and overlook; After a class, the students are very tired. After class, they should go outside to see the green plants and adjust their eyesight. (3 |, do eye exercises. Three don't: first, don't read and write in places where the light is too strong or too weak; Second, don't read when walking or riding a bike; Third, don't lie in bed and read on your desk.