Why can protanopes see yellow but not green when the relative absorbance of these two colour waves by the m cone can be identical?

  • $\begingroup$ What makes you think that "protanopes see yellow and not green"? $\endgroup$
    – Bryan Krause
    Commented Apr 14, 2023 at 15:00
  • $\begingroup$ Only because the colour wheels that I see keep referring to shades of yellow for what they can see $\endgroup$ Commented Apr 14, 2023 at 15:14
  • $\begingroup$ How else should they display the color wheel so you can view it? $\endgroup$
    – Bryan Krause
    Commented Apr 14, 2023 at 15:15
  • $\begingroup$ Are you saying that green could be substituted for yellow and that it doesn't matter? I was probably overthinking it because I know blue-green and red cones are involved in green colour vision, so I thought the brain would default to yellow because that only requires two cones or because the green cone can still "pick up" yellow waves. $\endgroup$ Commented Apr 14, 2023 at 15:22
  • $\begingroup$ Yellow makes some sense from the perspective of opponent-process theory of color determination, see e.g. this answer: biology.stackexchange.com/a/27486/27148 but really someone who is "red-green colorblind" sees all wavelengths, from red through blue, it's just that red and green can't be differentiated easily (especially in different shades). $\endgroup$
    – Bryan Krause
    Commented Apr 14, 2023 at 15:25


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