I spent all morning reading as a day-off treat to me and now my eyes are so knackered I can barely read anything. My prescription is up to date - is the tired eyes a keratoconus thing, a glasses thing, or a human thing? I didn't get it as a kid, and I read even more then. 
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oh, that's an interesting read. Note to self - experiment with different lighting conditions to see if that can help.
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