From early reports on the Nook Glow, it appears that scratches and dents in the glow light conduction layer is the Achilles heel of all of these new models. I've been waiting to see if either Kobo or Kindle did something different from the Nook and put a hard glass layer over light conduction layer, but apparently Kobo did not. You just have to be really careful not to scratch or dent the soft plastic, or the result will be very visible.
One remedy that does help scratched plastic screens is to rub a little vaseline over the scratch. It seems to have exactly the right optical properties to fill a scratch in plastic, although it doesn't last forever. I'm not sure I'd try that on a layered plastic screen though in case the scratch cuts though the layers and allows the vaseline to seep into the boundary.
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