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

Abstract: there is 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; Misunderstanding 1 of

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

the main causes of myopia in children 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. In fact, the expression

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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.

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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

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

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insist that outdoor sports 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 not treat myopia.