It is true that going outdoors for 2 hours during the day can prevent and control the onset of myopia to a certain extent. Because it can relieve visual fatigue and slow down the growth of the eye axis. Outdoor activities at night for 2 hours can not prevent and control the occurrence of myopia.
Outdoor activities during the day can allow patients to see as far as possible, the local muscles of the eyes can be fully relaxed, relieve ciliary muscle spasm, which can avoid visual fatigue, prevention and control of myopia.
During the daytime outdoor can get effective light for two hours, the central nervous system will secrete dopamine, can accordingly slow down the growth of the eye axis, prevent and control the occurrence of myopia.
While outdoor activities at night, in the darker light, patients may have blurred vision, which is more likely to lead to visual fatigue.
Therefore, 2 hours of outdoor activities during the day can effectively prevent and control the continuation of the occurrence.