I remember recently reading about the myopia increase in China and it was largely attributed to children staying much more inside, out of the sunlight, causing the eye to under-develop iirc.
They can test this if they tried getting students to try studying outside under natural lighting for a while. Though in China that may be impractical depending on the city.
Myopia is actually caused by your eye being "too long", and means the lens focuses light in the middle of your eye, rather than on the retina. It seems that sunlight ceases the development of your eye, rather than encouraging it.
Perhaps we evolved to "make use" of UV light to halt our eyes growth.
I read that it isn't a sunlight issue, but an overall brightness issue. If that is true, reading on a bright screen might be better than reading a book.
I wonder how much these are correlated.