Re the OP, I could not meaningfully comment on an abstract. However, I have access to a university library and was able to bring up the full article.
One important bit: The test was of the Sony PRS-600 vs. original iPad in normal indoor lighting only.
Originally Posted by AlbertaCowboy
There's a difference to me despite what the study suggests.
Here's some of what they suggest:
There was also a difference based on the device, with higher fatigue ratings for the LCD-device. However since this difference was already present at the pretest (T0) before any interaction with the reading device this effect represents a difference in baseline fatigue which persisted over time. Since it is the only measure which showed this baseline effect, this may reflect a negative subjective bias towards reading on a tablet from the beginning of the experiment. Interestingly the device × time-interaction did not approach significance suggesting that general fatigue increased in a similar manner when reading on one or the other device.
Perhaps I am being unfair to the authors by quoting a passage above that people can jump on. I have to recommend reading the whole thing.
I wonder whether there might be a difference because the iPAD is larger than the ideal size for plain text reading.