Blue-Green Color Blindness (Tritan)

    Blue-Green Color blindness is one of the rarest forms of color blindness.  It is an autosomal dominant trait, which means that it only takes one copy of the gene to express it outwardly.  There are two types of blue-green color blindness:  Tritanomaly and Tritanopia.  Tritan defects are often inherited, however, Tritan defects can also be caused by UV damage from the sun, exposure to certain chemicals such as mercury, or a hard hit to the head.

     Tritanomaly

     Tritanomaly is the most common of the two types of blue-green color blindness. This is because it only takes one copy of the gene to express it.  Tritanomaly is where the S-cone (blue cone) is shifted towards the M-cone (green cone) to where it overlaps more than usual.  This makes blue and green hard to tell apart.  Tritanopes are most likely to confuse:

     -Light Blues with grays

     -Dark purples with black

     -Mid greens with blues

     -Oranges with reds

     -Purples with blues

     -Some purples with pink

     Tritanopia

     Tritanopia is the rarest form of blue-green because you need two copies of the gene inorder for Tritanopia to be expressed.  Tritanopia is where there are no S-cones in the eye, only M and L-cones (red cones).  

     - If you have any questions or think I need to add anything else to the article, let me know in the comments  :)