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I had a similar issue in adjusting from the PRS-500 to -505. I had headaches just like you describe. It went away after a few weeks, but it was very frustrating at the time. I even thought maybe it was the silver body and tried skins. I couldn't find any posts back then about the -505 causing headaches. All the posts were about how wonderful the new -505 screen was. I wondered what was wrong with me! Also I noticed you have the iPod Touch 4G in your list. When I've been using my iPhone 4 for awhile, I have difficulty readjusting my eyes from the retina display to my ereader screen. A lack of "visual focus" is a good descriptor for how I feel too.
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