Blue-Yellow Color Blindness
Tritanopia and tritanomaly are commonly referred to as blue-yellow color blindness. These disorders distort the way the cells in the eyes receive different colors and tones that are in the short-wavelength spectrum of visible colors. Blue-yellow color blindness is not linked to the gender of a person, as the gene that causes the defect is located on chromosome seven. This chromosome is used equally in both sexes and is not in any way related to the gender of the person who is experiencing it.
The picture on the right is how people with blue yellow color blindness see things.
This form of color blindness is extremely rare, with tritanopia being present in less than one percent of the entire population of both sexes worldwide. Tritanomaly is even more rare, with less than about 0.01% of people affected by it. Because of its rarity, there is very little data concerning this type of color blindness. However, it is known that reds and greens are unaffected, and some yellows may be visible on the lower end of the spectrum with this disorder. Generally, with tritanopia the short-wavelength cone cells are simply removed from the equation and as a result, there is no difference in the blue-yellow spectrum of light. However, tritanomaly is simply a mutation of the gene on chromosome seven and may allow the person to retain some differentiation.
Unfortunately, there is no treatment currently available for color blindness of any kind outside of the person learning to distinguish different colors by their brightness or other subtle differences. On the other hand, there has been some research done on certain primates that are dichromatic (have two types of cone cells) where researchers have been able to give them a third cone cell type to allow them to see in much the same way humans see. This means that a cure for color blindness may not be as impossible as it once seemed.