More than 30 years ago, primary and secondary school students wore very few glasses, especially in the countryside, where glasses were rare. Today, there are still fewer children wearing glasses in the country. According to statistics, the proportion of middle school students in urban myopia is 4-5 times that of rural areas. One of the reasons: the lighting conditions are too good When analyzing rural children with less myopia, many people will come down to learning, short reading time, and low work pressure. Of course, this is the reason for one side. However, when those children who had studied hard under the oil lamp for many years, why did their lighting conditions improve at night after going to college, but they put on glasses? A few years ago, listening to an old man from the countryside said that the city's myopia is mostly because the lights are too bright. At that time, I only thought that this made sense, but I could not tell the reason. Once upon a time, we repeatedly emphasized the need to protect children's vision. The main measure is to improve the lighting of classrooms and libraries. Parents buy the best table lamps for their children and improve their nutrition. The result is more and more myopia. Now we know that the desk lamp is a sight killer. The old man from the country is right. There are many children with myopia in the city. One of the reasons is that the lighting conditions are very good. Why is the lighting condition too good and easy to be nearsighted? There is a phenomenon called night myopia, which is clear in the daytime, but you need to wear a myopia at night. The reason is that there is a difference in refractive at night, and the imaging of the object is partial. Experiments have shown that keeping monkeys in a dark house can cause the monkey to be farsighted. Therefore, in the darker light, the object is imaged earlier than the light under the bright table lamp, and the light is brighter and backward. In this way, when the light is bright, the elongation of the eye shaft naturally adapts to the reaction. The three major causes of myopia in today's society 1, too little outdoor activities The living space is too small now. The child is active indoors most of the time. There are many eyes in close-up use, and the child's eye adaptability is very strong. It will adjust to adapt to this close distance. Moreover, when there is more in the house, the chances of watching TV and playing computer will increase. If you don't pay attention to distance and posture, it is easy to make your eyes fatigued. 2, mainly indoor games What have we played before? Playing gyros, throwing sandbags, hide and seek, rolling hoops... In short, most of them are outdoor group activities. When you are outdoors, your eyes will automatically adjust to see things at different distances. Use your eyes alternately, so that the ciliary muscles of your eyes are adjusted and you won't feel tired. Nowadays, for reasons of safety and convenience, parents are most likely to let their children play at home. Even if you have children to play with, not to go to his home is in your home, or to play indoor games. In this way, the child is using the eyes at close range, and the burden on the eyes is heavy. 3, the light is not strong "Is the lighting enough? I am worried that the light will be too dark to affect the child's vision." We generally think so. In fact, ophthalmologists believe that the light of children reading and writing is not too dark, but too bright! Excessive light can make your child's eyes feel tired easily. The child needs soft light, and the light is guaranteed to come from the left front of the child. Therefore, when children read and write at night, they can choose the light that can adjust the brightness and brightness, and adjust the brightness to soft. our selection of rod choke inductors, common choke power inductors, and common mode inductors, crafted with precision and expertise. Rod Choke Inductor,Common Choke Power Inductors,Choke Common Mode Inductor,Common Mode Inductor Huizhou Show-Grand Electronics Co., Ltd. , https://www.sgtransformer.com
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