I’m very myopic and I remember reading a lot but I also know that I spent most of my spare time outside. We lived in a small home in Texas. There were six in the family and my grandmother watched soap operas which I was not allowed to watch and was run outside. In fact, I only got to watch TV on Sunday nights. Did I mention no air conditioning?
I read alot as a child and now. But only when confined. Other than that, I was out riding bikes, playing ball or any other tomboy activity I could find.
Of course there are always exceptions to the rules.
Ditto that (including the bit about "no air conditioning"), except for being "in the country" in South Louisiana.
My childhood was just the same, except that it occured in what was then rural Maryland. I too am very nearsighted. I read a lot as a child, but spent most of my time outdoors in the woods hunting and tracking with a bow and arrow or a BB gun, so I can’t blame TV.