I upvoted, because it is an extremely interesting theory, which could potentially explain vision problems. But unfortunately it is simply does not fit real worl

I upvoted, because it is an extremely interesting theory, which could potentially explain vision problems. But unfortunately it is simply does not fit real world data: a lot of kids around 6yo start loosing ability to focus on stuff right in front of them (like a book) despite both reading quite a bit, and spending significant time outside.