Oh, I'm not disagreeing with you that eInk devices are better for reading on, but "hurting your eyes" generally simply means that you have the backlight set too bright. Think about it for a minute: your brain doesn't care whether the screen is emitting light or reflecting it from another light source - the net result of either is that photons enter your eye and stimulate the optic nerve. There's no physical reason that an LCD screen should be worse for your eyes than an eInk screen.
I read on both eInk (Kindle PW2) and LCD (Apple iPad Mini), and each has pros and cons. The Kindle is lighter to hold, and far more readable in direct sunlight; the iPad has a larger screen and is of course in colour, which can be beneficial for some types of reading material. Both are good reading devices.
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