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what I bet causes more eye strain for people using LCD or other panels is not the nature of the panels/display tech but rather that today people don't vary their field of focus often enough because we all spend waaay to much time staring at a statically positioned display. I know I read a white paper a few years back that mentioned those who used laptops exclusively had less eye issues compared to those using desktop systems with LCD's. The conclusion was that because the displays used by desktop users are pretty much the same distance away and people tend to always sit in pretty much the same position all the time as big factors in the matter. Of couse this has been the case since the advent of the desktop computer or before then for typists for that matter since they too tended to stare at their copy while typing.
I suspect the fact we don't usually hold our reading materials at the same distance/position all the time helps boost the positive results many peopel sense from their EPD panel devices.
I would also suggest that under the right lighting conditions an EPD panel is potentially more harmful due to reflecting BRIGHTER light than an LCD would emit. Think outdoors or with very bright ambient/overhead lighting resulting in more and stronger light being reflected back from the panel. So no solution is ever going to be perfect.
Still, I know when I actually do get eyes that feel tired it's because I have been working in a more static position for hours on end every day for a long period...and this is even though all I have used for over a decade and a half are laptops. But ya just need to do those eye exercises designed to help with this sort of thing...or get out and away from the displays once in a while...outside is good...
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