Which wavelength is most desaturated for a patient with Tritanopia?

In the context of Tritanopia, a type of color vision deficiency, individuals have difficulty with the blue-yellow color spectrum due to the absence or malfunction of the short-wavelength cones (S-cones) in the retina. Tritanopia specifically affects the perception of colors in the blue (approximately 450-495 nm) and yellow (approximately 570-590 nm) range.

Desaturation refers to the intensity or purity of a color, where a more desaturated color appears closer to gray, and a fully saturated color appears more vivid. For individuals with Tritanopia, they would perceive blue colors as less saturated compared to someone with normal vision because their S-cones are not functioning properly.

The wavelengths given in the options range from the blue spectrum to the yellow-green spectrum, and the assessment of desaturation must focus on what the patient perceives. At 492 nm and 498 nm, which are within the blue range, colors may appear more muted. However, the key wavelength in the context of Tritanopia and desaturation is at 569 nm, which is close to the transition between blue and yellow and falls into the area they struggle with, leading to further desaturation in that range. This combination of factors explains why