The problem with the trichromatic theory of color vision is that it did not adequately explain color blindness and why staring at the reversed American flag produced an afterimage of a flag with the correct colors.

Question

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The trichromatic theory of color vision proposed by Young and Helmholtz in the 19th century could not explain color blindness, which occurs when one or more of the three types of cone cells in the eye are not functioning properly. Additionally, the theory could not explain the phenomenon of afterimages, such as the one produced by staring at the reversed American flag, which suggests that there may be more to color vision than just the combination of three primary colors.

The Problem with the Trichromatic Theory of Color Vision Is