I don't understand this. I've been reading off of computer non-retina screens for >22 years. Never had a problem reading off of them before.
I have a Kindle Fire that is very easy to read without retina display. Do you think a non-retina display mini iPad will be harder on the eyes than a Fire?
BTW I'm looking forward to getting the mini iPad to replace the Fire. The mini will have the correct form factor with iOS functionality. And, will be just as easy to read on.
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Not only would I buy one for $300, I would pay more. In my work and on my own I'm on a screen a lot. A reading device of the correct, for me, form factor is what I need. Price? Not a problem for the correct device.