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I can work at a computer for hours, but when I do, i notice that I change my focal length frequently, and often look away from the screen.
When I read on my Kindle, I don't look away much, but concentrate on the screen.
This past week-end, I watched two episodes of Castle on TV, then the next day I saw John Carter in the movie theater, and the day after watched the video of Going Postal, which runs for about 4 hours. At all three of these events, I was staring at the screen with few if any looking away times. I ended the weekend with a screaming headache. this is not uncommon for me when I watch TV or movies a lot (more than maybe an hour a day)
So for me, e-ink is the preferred medium particularly for sustained concentration. I can't imagine trying to read for hours on a transmitted light screen without lots of breaks or distractions.
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