http://www.uic.edu/com/eye/education/eyefacts/ColorBlindness.htm
What are the types of inherited color vision defects?
There are three groups of inherited color vision defects: monochromacy, dichromacy and anomalous trichromacy. The last two groups are subdivided into red-green and blue-yellow types of defects. Inherited red-green color vision defects are more common in males (1 to 8 percent depending on race) than in females (about 0.4 percent). Inherited blue-yellow defects are rare in either sex.
Monochromacy—Rod monochromats, or complete achromats, are truly "color blind" since they cannot distinguish any hues (e.g., blue, green, yellow and red). They see only different degrees of lightness. For them, the world appears to be shades of gray, black and white. They also have poor visual acuity, aversion to bright light and nystagmus (an involuntary, rapid movement of the eyes).
To have rod monochromacy, someone must inherit a gene for the disorder from both parents. This condition occurs in approximately 1 in 30,000 of the population.
Dichromacy is a less severe form of color defect than monochromacy. Dichromats can tell some hues apart. Dichromacy is divided into three types: protanopia, deuteranopia and tritanopia.
Protanopia and deuteranopia are red-green defects. Persons with red-green defects have difficulty distinguishing between reds, greens and yellows but can discriminate between blues and yellows. Protanopes often can name red and green correctly because green looks lighter to them than red.
Males have red-green defects if they inherit a defective gene from their mother. Affected males pass the defective gene to all of their daughters but none of their sons. Females who inherit only one defective gene are carriers of that gene. Females who inherit the gene for red-green defect from both parents are affected.
Hereditary tritanopia is a blue-yellow defect. Persons with blue-yellow defects cannot see the difference between blues and yellows but can distinguish between reds and greens. Tritanopia is somewhat rare (affecting between 1 and 15,000 and 1 in 50,000) and occurs equally in both sexes. Triatnopes usually have fewer problems in performing everyday tasks than do those with red-green dichromacy.
Anomalous Trichromacy—The ability of anomalous trichromats to distinguish between hues is better than dichromats but still not normal. Red-green anomalous trichromacy is subdivided into protanomaly and deuteranomaly. Both types are inherited in the same way as for red-green dichromacy. The severity can range from mild to extreme. Some persons with the mildest forms may not even realize their color vision is abnormal.
A third type of anomalous trichromacy is tritanomaly. This condition is more often acquired than inherited.
My vote goes to the 'pucker factor' system!