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In the pilothouse, use blue-green (507 nm) or turquoise (495 nm) LEDs for night vision. Eight percent of males are red-green deficient [8], and will be groping blindly with low-level red or green night vision lights. (Women have an extra strong response to red-orange.) Even a higher percentage may have temporary alterations in perception of blue under varying conditions. Most people over 45 suffer from reduced light transmission into the eye.
Red-green deficiency is the most common type of colour blindness (99% of cases). A genetic glitch causes the red and green sensing cones to overlap more than normal. This makes it difficult to distinguish between certain shades of green and brown, red and brown, and yellow and orange. Pinks can appear gray, purple and blue get mixed up a lot, and a green light may appear bright white.<ref>http://arstechnica.com/science/2016/02/seeing-in-techicolor-one-month-wearing-enchromas-color-blindness-correcting-glasses/</ref>