Does eye fatigue easily lead to myopia? Is there any scientific basis for this statement?

The main causes of myopia are the rapid growth of axial length, the enlargement of eyeball, the backward movement of retina, the distance between light focus and retina, and blurred vision. The development of eyes is mainly at the young age, which is also the age when most people begin to be nearsighted. With the study of myopia by humans and animals, more and more evidence shows that ambient light exposure is an important factor to regulate eye growth. The researchers first proved this in chickens. Chicken is a general laboratory model for studying vision. By installing protective glasses for chickens that can change the resolution and contrast of input images, the risk of myopia of poultry can be increased under the control condition that only the light intensity can be changed.

During the day, if possible, the chickens taking monocular photos are kept in the wild rural environment suitable for chickens, and the chickens in the control group are kept indoors with incandescent lamps. In all groups, myopia appeared in the eyes wearing protective glasses. Compared with the control group, the myopia rate of chickens raised in the field decreased by 44% on the fourth day. According to the research of the Institute of Ophthalmology, University of Tubingen, Germany, the development speed of experimental myopia in chickens is about 60% slower than that in normal chickens under indoor lighting conditions, which is because the light level is higher (the same as that seen from the outside). Researchers in other places have also found similar eye protection effects of high illumination in rhesus monkeys.

Growing up, parents and teachers told us to watch less TV and computers, and not to read too close to prevent myopia. After all, you still wear glasses. At present, the known causes of myopia are related to heredity, region and close eye use, but the pathogenesis of myopia is still inconclusive. Dr. Sayanaya of the University of Western Australia published an overview in the British Journal of Ophthalmology, pointing out that exposure to brighter light can reduce the risk of myopia. Ian Morgan, a myopia researcher at the Australian National University, also said that in order to avoid myopia, children should spend at least three hours a day in the light of 10000 lux.

Ian Morgan and the research team of Zhongshan Eye Center conducted a three-year experiment to test whether increasing outdoor activities can protect children's eyesight. They randomly selected six schools in Guangzhou and added 40 minutes of extracurricular activities before class for more than 900 children aged 6-7. In addition, they also chose six schools as the control group, keeping the course content unchanged. The test results show that the myopia rate of children who increase extracurricular activities is 30%, and that of children who do not increase extracurricular activities is 40%.