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.
Same story here. Very nearsighted, no air, no TV, lot of time outside.
One good thing about being nearsighted, though; Christmas lights look awesome. When I take my glasses off, it’s like I’m looking at six times as many lights.