What are the causes of most myopia?

summary

To sum up, there are only two factors: heredity and environment. Human visual organs adapt to the continuous variation and evolution of external light. So what are the causes of most myopia? What about it? Let's take a look at it.

What are the causes of most myopia?

First: according to the group survey, the incidence rate of myopia among different ethnic groups has been very different. Asians think that Chinese and Japanese are more myopic. European Jews are more myopic than British and German natives. In 1919, stephoson investigated the refractive status of children in London. It was found that Jewish children had about 10 times more myopia than local children.

Second: generally no obvious fundus changes, corrected vision can be normal, is the most common kind of ametropia. In the twin survey, it was found that both the coincidence rate and diopter difference of myopia were greater in the same Mao than in the different Mao, which was statistically significant, and suggested that genetic factors played an important role in the occurrence of myopia. Simple myopia is multifactorial. In conclusion, high myopia is autosomal recessive;

Third, some environmental factors can increase eye accommodation and form a certain degree of refractive myopia. Whether it can make the axial length of the eye become longer and form axial myopia is still questionable. Recently, a prospective study was conducted in China to observe the role of environmental and genetic factors in the pathogenesis of myopia. The subjects were students with normal vision. During the follow-up two years later, various factors affecting myopia were analyzed and judged. The results showed that in terms of genetic factors, the ratio of the new incidence of myopia between the children whose parents had no myopia and the children whose parents had myopia or both were myopia was 1; 2.3； 3.8, in terms of environmental factors, the reading time after class is (1-2 hours); 3；（ 4-5) was 1; 2.1； 3.2.

matters needing attention

Therefore, heredity and environment are two important factors that affect the occurrence of myopia. It is concluded that the change of environment is the decisive factor in the prevention and treatment of myopia.