A loss of visual perception without loss of consciousness, often occurring during high-speed maneuvers in aircraft; also refers to the graying or dimming of a screen display.
Compound of 'gray' and 'out,' emerging in aerospace terminology in the 20th century to describe a physiological phenomenon, and later applied to computer graphics terminology.
Fighter pilots experience 'grayout' when G-forces push blood away from their eyes during extreme maneuvers—it's the scary cousin of blackout, and understanding it saved countless pilot lives!
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