My eyes get blurry after reading for a long time on both the kindle and physical books. I get lost in the book and forget to focus my eyes at a distance intermittently. There's no eye-strain though, and the blurriness lasts no more than a few minutes. It's not a new problem for me. I have memories of having difficulty re-focussing my eyes quickly in my childhood when I ran out to play after having done my homwork
