Myopia 600 degrees belongs to moderate myopia, 625 degrees or more belongs to high myopia, high myopia is more likely to be hereditary, medium and low myopia is mostly caused by acquired, there are also statistics found that both parents have myopia, the children’s myopia rate is high, from this above seems to be determined by genetics. In fact, if you think about it the other way around, it is because when parents are young, they may love to read books or work at close range, and after the child is born, they may love to read books, and then they may work or study at close range, which is also caused by improper use of the eyes, so this aspect may need further research. In fact, it is now believed that the majority of myopia is mainly caused by acquired factors, improper use of the eyes, the most important is the lack of light outdoors, indoor prolonged use of the eyes at close range.