and deuteranopes are able to match all red-green mixture ratios.
have a normal M gene, whereas deuteranopes have a normal L gene.
Those with colour vision defects see the spot differently; for example protanopes
usually describe it as blue or dark because their red sensitivity is reduced, and most deuteranopes cannot see the spot at all.
The classification plates are more effective for deuteranopes than protanopes, with a correct classification possible for around 90% of deuteranopes and around 80% of protanopes.
22) All deuteranopes and 96% of protanopes failed the test.
The neutral points for deuteranopes, protanopes
and tritanopes are around 498nm, 492nm and 569nm respectively.