The human eye has more difficulty seeing blue and green colors at night than other colors, such as red. This is because blue and green light have shorter wavelengths, which scatter more in the Earth's atmosphere and are absorbed by the eye's photoreceptors less efficiently than red light. As a result, blue and green light appear fainter and more difficult to see at night. This is why emergency lights and signs are often designed with red or other bright, contrasting colors that are more visible in low-light conditions.

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