In my anecdotal experience, decreasing screen size has a significant impact on eye strain. I get the most train when I'm using the TV as a screen and the least

In my anecdotal experience, decreasing screen size has a significant impact on eye strain. I get the most train when I'm using the TV as a screen and the least on the iPhone. Well actually, the nook still has the least but the iPhone is negligible. Makes a fair amount of sense if the cause is due to excess light.