Abstract: infants have small eyeballs, so they are hyperopia. However, with the increase of age, it develops to normal at puberty, with an eye axis of 24 mm. If the development is excessive and the axis of the eye is too long, it will become myopia. Generally lower than 600 degrees. Mild myopia often begins at school age and stops after the age of 20., Why is the myopia rate of rural children far lower than that of urban children? In the past, the medical community believed that because the vision of rural students was wider than that of urban students, rural students often looked far away, so their vision was better than that of urban students. But this argument is not convincing. In recent years, Western nutritionists have found that the occurrence of myopia is related to too little intake of a nutrient called lutein., There are three reasons for myopia: 1. Genetic factors: domestic and foreign scholars believe that myopia has a genetic tendency, especially those with high myopia above 600 degrees. This kind of myopia is called congenital myopia, which is usually shown before the age of six. Therefore, scholars at home and abroad focus on this aspect. It has been reported that there are at least 100000 gene codes related to the eyes. After looking for more than 20 genes around the eyes, it has been found that two genes seem to be closely related to myopia, one of which exists in the peripheral structure of the eyes and the other in the optic nerve, which is responsible for transmitting image information. The researchers also conducted an in-depth study on 250 families and found that the parents of those with high myopia also have high myopia, and the degree of myopia gradually deepens with the increase of age. After the age of 20, myopia still tends to develop, and the anterior posterior diameter of the eyeball is still growing. The reason is that in youth, the endocrine is active and unstable, and pay no attention to eye hygiene, resulting in the lack of some inhibitory factors in the body, resulting in the continuous increase of myopia., 2. Developmental factors: scholars believe that infants have small eyeballs, so they are hyperopia. However, with the increase of age, it develops to normal at puberty, with an eye axis of 24 mm. If the development is excessive and the axis of the eye is too long, it will become myopia. Generally lower than 600 degrees. Mild myopia often starts at school age and stops developing after the age of 20. If you make rapid progress in childhood, 15—2 (1) it develops rapidly at the age of, and then gradually slows down. This kind of high myopia often exceeds 600 degrees, and is often accompanied by obvious axial growth and fundus degeneration. This kind of developmental myopia is most likely to occur in girls before the age of 13 and boys before the age of 15. 3. Environmental factors:, which have been studied most in China. To sum up, children’s homework burden is too heavy and long-time close-up homework Questions, lighting problems, hard pen writing problems, paper reflection problems, nutrition problems, fever diseases, desk problems, etc.,
why is the myopia rate of rural children far lower than that of urban children? In the past, the medical community believed that because the vision of rural students was wider than that of urban students, rural students often looked far away, so their vision was better than that of urban students. But this argument is not convincing. In recent years, Western nutritionists have found that the occurrence of myopia is related to too little intake of a nutrient called lutein.
three causes of myopia
1. Genetic factors:
domestic and foreign scholars believe that myopia has a genetic tendency, especially those with high myopia above 600 degrees. This kind of myopia is called congenital myopia, which is usually shown before the age of six. Therefore, scholars at home and abroad focus on this aspect. It has been reported that there are at least 100000 gene codes related to the eyes. After looking for more than 20 genes around the eyes, it has been found that two genes seem to be closely related to myopia, one of which exists in the peripheral structure of the eyes and the other in the optic nerve, which is responsible for transmitting image information. The researchers also conducted an in-depth study on 250 families and found that the parents of those with high myopia also have high myopia, and the degree of myopia gradually deepens with the increase of age. After the age of 20, myopia still tends to develop, and the anterior posterior diameter of the eyeball is still growing. The reason is that in youth, endocrine is active and unstable, and pay no attention to eye hygiene, resulting in the lack of some inhibitory factors in the body, resulting in the continuous increase of myopia.
2. Developmental factors:
scholars believe that infants have small eyeballs, so they are hyperopia. However, with the increase of age, it develops to normal at puberty, with an eye axis of 24 mm. If the development is excessive and the axis of the eye is too long, it will become myopia. Generally lower than 600 degrees. Mild myopia often starts at school age and stops developing after the age of 20. If you make rapid progress in childhood, It develops rapidly at the age of 15-2 years and gradually slows down later. This kind of high myopia often exceeds 600 degrees, with obvious axial growth and fundus degeneration. This kind of developmental myopia is most likely to occur in girls before the age of 13 and boys before the age of 15.
3. Environmental factors:
Domestic research is the most. To sum up, children’s homework burden is too heavy, long-time and close work problems, lighting problems, hard pen writing problems, paper reflection problems, nutrition problems, fever diseases, desk problems, etc.
how to prevent myopia
1. Control watching TV, using computer TV and computer to enter the family. Children can increase their knowledge and broaden their horizons. However, because of the strong light, the image has flash movement, and the viewing time is too long, which leads to tension and fatigue of eye muscle regulation, which will damage vision and produce myopia.
2. Sit upright and read and write upright. Eyes 1 foot away from books; This distance is in line with the physiological function of eye regulation, which can minimize the regulation tension of eye muscles and reduce eye fatigue.
3. To maintain a good reading and writing posture, you must correct bad habits, such as tilting your head, squinting at written words, lying reading, walking reading, or reading under the condition of shock and shaking or at dusk.
5. The most ideal light source for improving lighting is natural light source. Poor light sources can unknowingly cause damage to the eyes. Too strong or too weak light is harmful to the eyes. A large number of studies have shown that students’ myopia is directly related to the long-term application of unscientific lighting sources at night. Therefore, special attention must be paid to lighting, and good lighting lamps with sufficient brightness should be selected.