After looking up some information, this statement is indeed reliable:

Spending 1.5 to 2 hours outdoors every day can significantly reduce the incidence of myopia in children. There is a saying in the ophthalmology community: the most effective medicine for preventing myopia is not atropine, but the sun.

Mechanism one: bright light → dopamine → inhibit the elongation of the eyeball,

mechanism two: large variation in viewing distance in outdoor environments.

So eye protection = 20-20-20 + 2 hours outdoors:

Every 20 minutes of close reading

Look at 20 feet (6 meters) away

For 20 seconds

Plus at least 2 hours outdoors every day

This combination is currently recognized as the most effective habit for preventing myopia, and it is recommended to keep a record for yourself and your children.

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