Vision Is All About Change
In the past minute alone, your eyes made as many as 240 quick movements called “saccades” (French for “jolts”). In your waking hours today, you will very likely make some 200,000 of them, give or take a few thousand. When you sleep, your eyes keep moving — though in different ways and at varying speeds, depending on the stage of sleep.
.........what may be most surprising is that large eye motions and miniature eye jolts help us see the world in similar ways — largely at the same time.
more: http://www.nytimes.com/2013/05/19/opinion/sunday/vision-is-all-about-change.html?ref=opinion&_r=0
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