Red Weak

A misleading name for Protanomaly.

The name derives probably from the red-green opponent channel, which is – by definition – skewed permanently to the green side in Protans.

“Red Weak” infers that the L-Cones in Protanomals are someone less sensitive, which is not true. While a weakened L-Cone could theoretically cause a protan defect, there is not a known mechanism of Protanomaly. L*-Opsins are not less sensitive than L-Opsins, they simply have a different Peak Wavelength, which effectively decreases the maximum amplitudes of the red-green Opponent Channel.

However, “Red Weak” does correctly infer that the individual sees reds (and some orange) as darker.

See Red Blind.