Hunters know they need to scan. Pilots know they constantly need to scan, not only for enemies in combat but also incoming aircraft in civilian life. Snipers in the military are taught to scan. The reason is that the mind does not process images visually between the focus point and the eye. It is not unlike selective hearing in a crowd.
As marvelous as the body is, it can work against a person. Drivers need to scan.
William J. Mareska, D.D.S.