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By definition and function, the human eye is one of the most important and complex
systems in the world. Basically, its job is to accept images from the outside world
and transmit them to the brain for recognition and storage. In other words, the
organ of vision is our prime means of identifying and relating to what is going on
around us.
It has been estimated that 80 percent of our total information intake is through the
eyes. In the air, we depend on our eyes to provide most of the basic input necessary
for performing during a flight: attitude, speed, direction, and proximity to things
(like the ground), and opposing air traffic that may constitute a danger of in-flight
collision. As air traffic density and aircraft closing speeds increase, the problems
of in-flight collision grows proportionately, and so does the importance of the
"eyeball system." A basic understanding of the eyes' limitation in target
detection is probably the best insurance a pilot can have against running into
another airplane - something that can spoil your whole day.
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