&gt; Deuteranomaly ... The medium-wavelength pigment is shifted towards the red end of the spectrum resulting in a reduction in sensitivity to the green area of the spectrum. [0]<p>The closer the spectrum perceived by the M (green) cone is to L (red) cone, the harder is is to differentiate red from green.<p>[0] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Color_blindness#cite_ref-KallColor_26-1" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Color_blindness#cite_ref-KallC...</a>