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→Night Vision
Red (630 nm) is an internationally recognized attention colour traditionally favoured for its excellent ability to preserve night vision. However, red erases red lines that indicate hazards or danger on aeronautical and military maps and charts.
Today most pilots and the military have switched to other colours for night vision protection. Green is now the established colour. In 2004 it was introdced introduced in the Daimler-Chrysler 300C. Green is also great for retaining night vision, and it is easier on the eyes.
However, there appears to be a slow transition to blue. The military is using blue over red increasingly. Blue eliminates many colours on maps and charts, changing everything to shades of a bluish-grey. Blue is also a great reading light. It imposes less eye strain than incandescent, especially for aging eyes. However, blue affects your circadian rhythm and makes it hard to fall asleep.