Most adults read about 200 to 250 wpm (words per minute). Spritz helps you double or triple your reading speeds by displaying one word at a time. It helps keep your eyes centered so you aren’t moving, a similar principle to what they teach for speed reading (taking in large chunks of words at a time and minimizing movement).
Add-on for Google Chrome browser called Spreed
Another example of this technology is the Samsung GS5 and Gear 2 watch for reading emails or text messages.
Read more information here.