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Changes in the light dispersion layer could be caused by a lot of things besides the touch taps. Like vxf said above it could be temperature or humidity or who knows what.
It's obviously a very very thin layer of some kind of material that has to disperse the light from the bottom of the Kindle all the way to the top. It could turn out that this method of screen lighting is fundamentally flawed. The light dispersion layer could change after a few hundred hot and cold cycles, or after a few thousand taps or just as it ages.
My wife and I both sent our Paperwhites back today. It was very hard for me to do and I'm feeling somewhat depressed about it. But I just didn't feel like I can trust the screen. I was always peering at it to see if something had changed or something was wrong.
So back it went. My wife also has a Fire HD which she has no problem reading on. Perhaps I'll borrow that for a couple of long term reading sessions and see if it would suit me. I think, if it turns out that there is a backlash against the Paperwhite's lighting, it might be near the end of the line for eInk. Tablets are improving radically while eInk devices seem stuck.
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