Using feeling based optimization. I figured out how one could make a simple alteration to books to make them much easier to read. I don’t read that many books because my eyes feel strained. I interpret the feeling I get that my brain doesn’t like to focus on a whole page of text. So the idea is to visually cut the text into smaller pieces. I did this by simply making three lines that cut the page text into an equal amounts. The size of the piece was what I felt was near the maximum I could focus on. I also made the lines longer than the text area so my brain would have an easy time to home in on where I was in the text. I guess the brain just remembers what line it was and the distance up or down from that.
From all of this I draw the conclusion that we have an optimal width and height limitation of the text area we are about to read.
Below is the example I made in a paper book. For the web and software on tablets or phones I think one could easily implement such a feature. Here you could also make the size of the pieces variable so to fit the reader.