Abstract: the analysis of the age of onset shows that children with genetic factors as the main cause have an early onset, Early childhood (before the age of 7) may be myopia. The earlier myopia occurs, the more likely it is to form high myopia in adulthood.
1. Causes of myopia
01, genetic factors
It means that if the myopia degree of both parents or one of them is higher than 600 degrees, the probability of myopia of children will be higher than that of children of parents with normal vision. The analysis of
from the age of onset shows that children with genetic factors as the main etiology have an early onset, Early childhood (before the age of 7) may be myopia. The earlier myopia occurs, the more likely it is to form high myopia in adulthood. Pathological myopia may continue to develop after the age of 20. High myopia not only leads to a serious decline in vision, but also causes a series of pathological changes in the eyeball, which seriously affects the quality of life and work in adulthood.
02. Environmental factors
generally occur in the vigorous growth and development of adolescence. Statistics show that ametropia before the third grade of primary school is mainly caused by hyperopia, astigmatism and congenital myopia. After the fourth grade, the proportion of simple myopia increases. Ametropia among high school students is mainly caused by myopia. The initial age of myopia caused by environmental factors is mostly 10-15 years old, and more than half are concentrated in 12-15 years old, that is, adolescence. But in recent years, with the improvement of people’s living conditions and the popularity of TV and computer, the age of myopia has an early trend. Simple myopia tends to be stable around the age of 20.
2. How to prevent myopia
this is an issue that has aroused widespread concern in the society. The theme determined by the national health and Family Planning Commission for this year’s 66 eye love day is “bathing the sun and preventing myopia”. Today we introduce three main methods for parents to prevent myopia.
01. Eye distance and time
as early as the 18th century, scientists found that the occurrence of myopia was closely related to long-term close eye use. School age children should pay attention to eye distance and posture. One fist, one foot and one inch are what they need to pay attention to before reading and writing. A fist refers to the distance between the abdomen and the table by one fist to prevent writing on your stomach. One foot can bend the forearm, put the elbow on the table, pinch the palm into a fist and put it on the chin, which can make the body sit straight. When holding the pen, you can put two fingers horizontally between the pen tip and finger tip, and don’t press your thumb on your index finger.
every time before reading and writing, first put a fist, foot and inch posture, which can effectively prevent visual fatigue. When reading and writing, it should last for 30 minutes and rest for 10 minutes. When using eye protection table lamp, it should not be placed on the side of the writer to prevent blocking the light.
02. Daily outdoor activity time
is currently recognized as the most economical and effective method to prevent myopia. That’s an hour of outdoor activity every day. As the name suggests, outdoor activities are to go to the sun and receive sunlight, because strong illumination can stimulate the retina to secrete dopamine and prevent the growth of ocular axis. Outdoor activities are recommended to reach one to two hours a day.
parents can choose the method of intermittent exposure, and take the initiative to be exposed to the sun outside at noon and afternoon after school by taking advantage of recess, radio exercises, physical education classes. Persisting in outdoor activities for 1 hours per day can reduce the incidence rate of myopia by 10 – 20%.
03, and electronic products using
electronic products themselves will not cause myopia. However, the long time and short distance use of mobile electronic products will lead to the increase of myopia incidence rate. Therefore, we recommend using electronic products for no more than 30 minutes every day, and try to avoid close-up electronic products such as mobile phones and tablets.