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Colors - Colorblindness is a type of visual condition which makes people having difficulty in recognizing and differentiating between some colors.
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Origin - John Dalton was the first person to study the disorder. Daltonism, the name of one form of colorblindness, comes from him.
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Origin - Daltonism is another name for protanopia, a genetic condition which is usually linked to the X chromosome.
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Red and green - Is some cases of protanopia, individuals will have difficulties in distinguishing between some tones, such as red and green.
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Tonality - In other cases, the person can see colors, but in a weaker tonality.
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Percentage affected - In some parts of the world, up to 8% of men and 1% of women suffer from colorblindness.
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Genetics - The majority of cases occur in men and are inherited.
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Keanu Reeves - The star revealed in an interview that he suffers from colorblindness.
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Eddie Redmayne - The British heartthrob also suffers from colorblindness.
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Bill Clinton - The former American president has difficulties in distinguishing reds and greens.
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Meat Loaf - The singer's colorblindness prevented him from joining the American army.
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Christopher Nolan - The movie director is colorblind, but this hasn't held him back from being brilliant at what he does.
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Rutger Hauer - The Dutch actor was part of the Navy as a teenager, but his colorblindness prevented him from following this career.
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Mark Zuckerberg - Some say that Facebook is blue because Mark can tell the difference between the tones of this color.
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Prince William - According to the health site: Health Research Funding, Prince William also suffers from colorblindness.
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