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After reading all the links and reading about this topic for many years, I'm really thinking the current decline in kids' vision is more to do with them not being outside as much. Your eye muscles are constantly being used to change focus... indoors how much distance are you changing, 20' at the most? That's not very much. But outdoors your muscles really get a better workout viewing objects miles away and not just the next wall.
I think too much screen time might make your eyes feel tired, LCDs vs eink vs paper might make some not sleep as well (although neither have ever bothered me and I've had bad eyesight all my life, I'm very farsighted). I don't believe using your eyes to read a lot makes you blind or even causes any eye disease no matter what medium you read from, book or screen.
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