tldr - more time outside in sunlight likely reduces myopia. kids these days don't want to go outside so you must force them.
Don't forget the scaremongering about skin cancer, dangers of the streets (or just the weather being crappy)
But to be honest outdoors is boring and just saying "ah go outside" means pretty much nothing.
Hang on - most people only need 15 to 30 minutes of direct sunlight per day for their vitamin D (and many people don't get enough), but that's not saying the risk of cancer is scare mongering.
Skin cancer is the most common cancer; melanoma is about 2% of skin cancer cases but very many more skin cancer deaths. White americans have about a 2.4% risk over their lifetime of getting melanoma. About 9900 Americans die each year from melanoma, and about 70,000 people new melanomas will be diagnosed each year.
And melanoma is one of the most common cancers in young adults.
The major risk factor for melanoma is exposure to UV light.
I'm pretty delighted, though, that people are finally getting a handle on the causes of myopia.
Yes, is this a trend even among prestigious scientific news publications, to leave out the summary and force readers to skim through many paragraphs just to get to this rather simple and predictable conclusion? Poorly written article and I'm disappointed in Nature.