Not being outside enough at a young age probably does give you nearsightedness, so it's kind of related. The key seems to be exposure to bright sunlight includ

Not being outside enough at a young age probably does give you nearsightedness, so it's kind of related. The key seems to be exposure to bright sunlight including the UV part so you could watch TV outside and I guess that'd work (modern windows are often UV blocking so cheating and watching in front of a window might not do it) To be fair, reading or doing anything else indoors while not getting outside much is just as bad, though.