Never tried polarized glasses, but that might be an interesting experiment. But as far as eye-strain, I find that in indoor situations a pda with a good screen is less eye straining than regular books. I can adjust the font as needed, and can pick a font that isn't so "busy" looking. But in outdoor situations it's generally not very useful.
And I would expect that an e-book will be much easier on the eyes than a pda or a paper book, as long as the font choices are decent.
It would also be really nice eventually as I get older to be able to choose big print e-ink and not have to buy those special book editions to help the eyes. Really big print is pretty silly on a tiny pda screen!
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