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TRICHROMAT - Has all 3 cones present, normal colour vision
ANOMALOUS TRICHROMAT - has all 3 cones, but partial deficency in one
DICHROMAT - Has 2 cone types present, 1 completely absent
PROTANOPE - Lacks l-cones “red”
DEUTERANOPE - Lack m-cones “green”
TRITANOPE - Lacks s-cones “blue”   Rare
MONOCHROMAT - Has only 1 cone type
ACHROMAT - No functioning cones,
                        rods only . sees well at night, but apart form that poor vison