This research seems almost comically flawed.
From the paper:
Quote:
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During LE-eBook reading sessions, the light-emitting device was set to maximum brightness and placed in a stand that held it at a fixed angle. This stand was placed on a table directly in front of the individual at a 30- to 45-cm distance from their eyes. Participants were allowed to turn pages on the LE-eBook, but were asked not to hold it while reading or make any adjustments to the settings. During the printed book reading sessions, participants were allowed to hold the book at any desired distance from their eyes.
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Apart from the obvious silliness of using the iPad at full brightness, if you're trying to isolate the differences between e-readers and paperbooks, why add all the physical constraints on distance, positioning etc. for the e-reader case but not for the paper book.
You could equally well conduct a study comparing the the use of a well-adjusted e-reader while lying in bed with reading a paper book lit by a kilowatt spotlight while hanging by one arm from the ceiling, and conclude that e-readers are better.
/JB