Rumor dispelling post: do you have to know about myopia?

Abstract: in fact, this statement is not accurate enough. Many studies have shown that increasing outdoor time instead of sunshine can delay the age of children developing myopia and reduce the risk of developing high myopia in adulthood. About 2 hours of outdoor activities a day can reduce the risk of myopia.

China’s myopic population is huge and frightening – 400 million. News like “men’s myopia is 2000 degrees, like blind people” and “female teachers’ myopia is 4100 degrees, unable to distinguish between men and women” emerge one after another on the Internet. Myopia prevention and control is urgent. How to prevent myopia and protect eyesight is a difficult problem for every parent.

however, there are often many misunderstandings in the endless methods of preventing myopia on the Internet. Misunderstanding 1 of

and

: the cause of myopia is not genetic problems, nor is it just excessive eye use caused by reading and writing, but lack of sunshine.

truth: the main reasons for children’s myopia are as follows:

1 Genetic factors: children whose parents are myopic and children whose parents are myopic have a higher risk of myopia than ordinary children.

  2. Environmental factors: reading and playing with mobile phones for a long time, the light is too dark or too bright, reading in a bumpy environment, incorrect writing posture, etc.

  3. Behavioral factors: too little outdoor exercise and too much close eye use.

  4. Disease factors: some diseases can also cause myopia. Myth 2 of

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: what is needed to prevent myopia is sunlight, because sunlight can stimulate the production of the chemical dopamine, which can prevent the anterior and posterior diameter of the eye from becoming longer. The truth of

and

: this statement is actually not accurate enough. Many studies have shown that increasing outdoor time instead of sunshine can delay the age of children developing myopia and reduce the risk of developing high myopia in adulthood. About 2 hours of outdoor activities a day can reduce the risk of myopia.

and

have no definite theory about the mechanism of increasing outdoor time to protect myopia, and there are many hypotheses. Some scholars believe that there is a great difference between indoor and outdoor light intensity. Under the condition of outdoor high-intensity light, the retina will release more dopamine, and dopamine can inhibit the growth of ocular axis; Some scholars believe that staying outdoors for a long time will relatively reduce the amount of close activities; Some scholars suggest that sports may play a role in protecting myopia, or there is less need for adjustment when staying outdoors; In addition, some scholars believe that it is related to the different spectral properties between indoor and outdoor; At the same time, some scholars believe that the ultraviolet intensity is different indoors and outdoors. Misunderstanding 3 of

and

: is sunlight a panacea for the prevention and treatment of myopia? The truth of

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: keeping outdoor activities can only reduce the incidence rate of myopia. For children who are already short sighted, they can only slow down the development of myopia, and can not treat myopia.

so how to scientifically prevent myopia and protect eyesight?

1: increase outdoor exercise time

for children who want to prevent myopia, the outdoor activity time is at least 2 hours, and 3 hours is better. However, it should be noted that do not expose yourself to the sun in summer, and do not look directly at the sun with both eyes, so as not to burn the retina and cause permanent visual damage.

2: establish the archives of refractive development.

have a comprehensive optometry every year since the age of 3 ~ 6, and establish the archives of refractive development. After the child is 3 years old, parents should take the child to a professional eye hospital for a comprehensive optometry examination 1 ~ 2 times a year, including diopter, eye axis length and corneal radian, to see whether the child belongs to the high-risk myopia group, and reasonably intervene the occurrence and development of myopia through years of testing.

3: scientific eye

1 Pay attention to the correct posture when reading and writing. Don’t read or use your mobile phone when walking or riding.

  2. Don’t use your eyes for a long time and rest for 10 minutes every 50 minutes or so.

  3. Ensure adequate sleep time.