I just found this article from The New Yorker about comprehension with online reading and training to read deeply on the internet. An interesting market: digital apps to train students in the tools of deep reading.

We read more quickly when lines are longer, but only to a point. When lines are too long, it becomes taxing to move your eyes from the end of one to the start of the next. We read more efficiently when text is arranged in a single column rather than multiple columns or sections. The font, color, and size of text can all act in tandem to make our reading experience easier or more difficult. And while these variables surely exist on paper just as they do on-screen, the range of formats and layouts online is far greater than it is in print. Online, you can find yourself transitioning to entirely new layouts from moment to moment, and, each time you do so, your eyes and your reading approach need to adjust. Each adjustment, in turn, takes mental and physical energy.

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Julie Coiro, who studies digital reading comprehension in elementary- and middle-school students at the University of Rhode Island, has found that good reading in print doesn’t necessarily translate to good reading on-screen. The students do not only differ in their abilities and preferences; they also need different sorts of training to excel at each medium. The online world, she argues, may require students to exercise much greater self-control than a physical book. “In reading on paper, you may have to monitor yourself once, to actually pick up the book,” she says. “On the Internet, that monitoring and self-regulation cycle happens again and again. And if you’re the kind of person who’s naturally good at self-monitoring, you don’t have a problem. But if you’re a reader who hasn’t been trained to pay attention, each time you click a link, you’re constructing your own text. And when you’re asked comprehension questions, it’s like you picked up the wrong book.”