I do worry about my kids' eyes. Before we got my daughter a Kindle, I got her 100 Classics for her DSi. My husband was the one that suggested the Kindle and I mentioned the brand new100 Classics. He noted that, that had to be miserable reading! But he was right, I personally don't want them reading for a lengthy amount of time on their DSs, phones or iTouches. I know that I personally find it uncomfortable to read a lot of articles on my phone.