[afv011]

The light is actually quite well distributed on the display. You'll notice a bit of a gradient at the top, near the light source, but after reading for a bit, odds are you'll completely forget about it. We used it for a bit in a darkened room, and it's really a pleasant reading experience, staying true to most of the benefits of e-ink. We asked Barnes & Noble reps how the resulting eye strain compares to a back-illuminated device like the iPad, and while they refused to say anything conclusive, they conceded it should be "equal or less" to what you'd experience on such a device.

Source