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I've been reading the speculation on what causes nearsightedness with some interest. I have spent most of my life with one near-sighted eye and one 'normal' eye.
At some point I had ended up favoring the near sighted eye for my nearly constant reading to the extent that I didn't actually realize when my 'normal' eye was too far-sighted to read without correction.
The idea that I had started favoring that eye for reading early on and that was the reason for the difference in eyesight makes more sense to me then most other explanations.
If so it certainly wasn't screen time as I didn't spend much time looking at screens until after my eyes had changed.
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