ABSTRACT
Human vision is an amazingly complex process that involves acquiring and processing massive amounts of visual and other information. Our eyes and brain collaborate, to pick up the visual information we are seeking and to discard redundant and unwanted information. As you read these words on the printed page your eyes are focused on the words. You can see a lot of other information on the page, but for the moment your brain ignores this extraneous information to some extent, allowing you to concentrate on the word of the moment and pass on to the next one, rather than becoming confused by taking in every word that your peripheral vision can see. This collaboration between eye and brain is a computational process that has evolved over millions of years and is one of the marvels of nature that we have come to take for granted. Those of us who can see rarely stop to think about how fortunate we are-the gift of sight is an assumption.
