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Description: Color blindness, also called color vision deficiency, is defined as the inability to see colour or see color differences. The name color blindness could be deceiving because there's no actual blindness, just inability to see certain colors or any colour in any respect. Color vision deficiency is a much more fitting name for this disease because it significantly defines the disorder. Color vision deficiency occurs when there is a problem with the pigments found in certain nerve cells of the eye called cones. Pigments are all color-sensing granules found in cones. Cones themselves are located in the retina which lines the back of the eye and can be light sensitive. There are several different forms of color vision deficiency caused by missing pigments within the retina. The most frequent type of colour blindness is a missing pigment which is responsible for a person trouble seeing the difference between red and green. If a different pigment is missing, that person might have trouble seeing blue and yellow colours. ItвЂ™s also possible to be missing more than one pigment causing trouble seeing or telling the difference between several different colors (Board). In very rare cases a man has been diagnosed with the most rare form of color blindness known as achromatopsia. A person with this rare form of color vision deficiency can't find any color at all which means that they see everything in shades of grey. Achromatopsia is typically linked with other vision malfunctions like severe light sensitivity, nystagmus (small jerky eye movements), lazy eye, and extremely poor vision (Board). There are three different kinds of color blindness; monochromacy, dichromacy, and anomalous trichromacy. Monochromacy is complete color blindness meaning that the person cannot see any co.. .