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The severity of red-green colorblindness can vary from mild to severe. Someone affected with a mild case may live their entire life without knowing they are affected. The majority of the people who are aware they have red-green colorblindness have moderate cases. In these individuals, there is some difficulty with distinguishing reds and greens from each other. In a severe case of red-green colorblindness, there will be difficulty distinguishing the colors, but there can also be a variety of other vision problems present. All other forms of colorblindness are more severe than red-green colorblindness. Dichromats, who are severely colorblind people, are missing an entire photopigment and must base their color vision on two photopigments from only two photopigment groups. The most rare and severe form of colorblindness is monochromacy. In this form of colorblindness, people cannot distinguish color at all. They must base their color vision on one photopigment from only one photopigment group. |
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The
picture above shows the vision spectrum of a dichromat.
The picture was borrowed from http://www.mcw.edu/cellbio/
colorvision/test1.htm Click on the above picture to learn more about the different types of colorblindness.
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