Seeing how the wearer reads is really-- staccato. It also makes me want to see what people look at when they play video games. Do game designers use eye tracking software? I can't really tell what my eyes focus on versus my brain.
Those are saccades. They keep the area of interest on the most sensitive part of the retina. Trying to understand how the brain produces stable vision from such a sequence of unstable "snapshots" is an area of active research.