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I am able to read for hours on both backlit and eink displays. But I have noticed that I squint/frown more when reading on the iPhone and my computer, which hardly happens on the eink.
And if I look away from a backlit screen after staring at it for a long time, I see a "shadow" of sorts and my eyes get really tired.
My eyesight will degrade as easily as if I read on a book or Nook STR, as compared to on a backlit screen, but at least the book/Nook does not make my eyes go wonky.
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