Hello JSED and welcome to MobileRead.
Because the PRS-700 has both a touch film and the light-wedge lighting, there's more plastic between the air and the eInk. Some people see that as dimming of the screen and others see it as blurring.
I have a PRS-505 and a Kindle. My hubby bought me the lighted cover for the Sony 505, and I'm enjoying it very much. I wish I could get the same thing for my Kindle.
Glad you're enjoying your Sony reader.
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