It is reported that the incidence of myopia in China is 33%, the number of myopia in the country reaches 400 million people, and the high prevalence of myopia – adolescent myopia is as high as 50% to 60%. Li Ling, director of the China Health Development Research Center at Peking University, pointed out that if existing policies are not changed, the prevalence of myopia in China’s population over the age of 5 is expected to grow to 50.86%-51.36% by 2020, with a prevalent population of nearly 704-711 million. Most of the myopia is caused by the lack of reasonable eye use, and school-age children have become the hardest hit by myopia. The prevention of myopia has been urgent, today to organize a few easy to cause myopia bad habits, parents need to pay special attention. Wrong posture of holding a pen, blocking the child’s vision, so that she can not see the tip of the nose, forced to bow or tilt the head to the left, thus closing the distance between the eyes and books, increasing the onset of myopia. According to statistics, about 95% of myopic students have the phenomenon of pinching or crossed pencil grip, and the wrong pencil grip has been neglected for a long time. Wrong sitting posture is one of the causes of eye and book distance, and some sitting errors, because the child’s height and desk and chairs do not match the cause. Can desks and chairs and students’ height together “long”? I also hope that the country can come up with a set of effective guidelines to deal with. After all, China has become the number one myopic country. In too strong or too dark light to read for a long time, is also prone to myopia a bad habit. This is because unsuitable lighting tends to strain the eyes. There is an idiom “chiseling the wall to borrow light” although it is used to describe poor families and hard work in reading, but it is never a good teaching material for children to learn proper eye care. Lie on the bed or lying on the bed to read, long time to maintain this posture, easy to make the blood flow to the eyes, resulting in mild congestion of the conjunctival vessels of the eye, easy to trigger conjunctivitis; In addition, lying on the bed to read the eyes will be unconsciously close to the book, causing spasm of the ciliary muscle, a long time will cause the eye length, size change, so that the ciliary muscle adjustment function becomes poor, the lens curvature increases, change the refraction, thus forming or aggravate Myopia. The popularity of electronic products makes some children love it, especially the game products make children excited, play is no time control, so the internal and external muscles of the eye for a long time in a state of tension and not rest. Crazy game at the same time, but also let the child’s sleep time reduced, thus aggravating myopia. The habit of reading books in the car or on foot can also be detrimental to the eyes. Because the carriage is vibrating, the body is shaking, the distance between the eyes and the book can not be fixed, plus the influence of light, more will increase the burden on the eyes, often so will also cause myopia. When sugar is metabolized in the body, it needs a lot of vitamin B1 to help and reduce the amount of calcium in the body. Vitamin B1 has a protective effect on the optic nerve, and its level will affect the state of the optic nerve. Calcium is the “protector” of the eye tissue, calcium deficiency will not only cause the retina to lose its elasticity, the pressure in the lens rises, the front and back diameter of the eye elongates, affecting the toughness of the eyeball wall, prone to myopia. Eating too much sugar can also increase myopia! Because eating too much sugar, blood sugar increases, correspondingly lowering the osmotic pressure of body fluids, so that the atrial water in the eye infiltrates the lens, causing lens deformation, increasing refractive error and aggravating myopia.