The Eye-Voice Span
The eye-voice span is the distance that the eye is ahead of the voice in reading aloud. (A simple experiment: try reading a page out loud. Chances are more than likely you will turn to the next page before you have said the final words on the page you are vocalizing.) Although this phenomenon has been studied for some eighty years, researchers have only recently begun using it as an important indication of the nature of the reading process.
This professional monograph presents one of the most comprehensive and succinct examinations of the topic available.