Quote:
Originally Posted by NullNix
Actually, very very blue light is *inversely* linked to short-sightedness: the reason glasses are so common if you read a lot is now known, is a fairly strong result as these things go, and it's got nothing to do with reading. It's that people who read a lot statistically also don't spend as much time outside when they're young as people who don't, and solar UV exposure on the back of the eye acts as a signal to trigger the lengthening of the eyeball, so the eye grows evenly and the image remains in focus. Without that, perhaps because you're inside under UV-poor artificial light, the eyeball doesn't lengthen enough and you get short-sighted. Wearing glasses that fully correct your vision when your eyes are still growing worsens this, because your eye thinks it's growing right when actually it isn't and has more lengthening to do... hence these days opticians intentionally undercorrect the vision of pre-adults with myopia. Of course Kindle screens don't emit UV light: the screen's not *that* blue. So they won't help here!
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Hmm... so if you tell your bookworm child to read outside, s/he should be all right?
Interesting. I guess that was certainly a factor in my eye development, but there were genetical reasons too, on my father's side of the family. Both my sister and one of my nieces had weak eyes as well, and they were not readers in childhood (the niece has never read for pleasure at all).