Research has shown that colour blindness can have many degrees caused by

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Colour blindness is caused by the absence or malfunctioning of certain types of cone cells in the retina that are responsible for color vision. Humans have three types of cone cells that respond to different wavelengths of light and allow us to see a range of colors. The number of functional color-vision genes an individual has can determine the severity of their color blindness. People with one functional gene are considered carriers and have normal color vision, while people with two non-functional genes are colorblind. The severity of color blindness can vary depending on how many functional genes a person has.

Research Has Shown That Colour Blindness Can Have Many Degrees