A person with color-blindness has trouble seeing red, green, blue, or mixtures of these colors.The most common type is red-green color-blindness, where red and green are seen as the same color.Color-blindness was discovered by John Dalton. John Dalton was so precocious that he charge of the local Quaker school at the age of 12.John Dalton described his own color blindness in 1794. In common with his brother, he confused scarlet with green and pink with blue. Dalton supposed that his vitreous humor was tinted blue, selectively absorbing longer wavelengths.Most color vision problems are inherited (genetic) and are present at birth. People usually have three types of cone cells in the eye. Each type senses either red, green, or blue light.For the most common type of color blindness—red-green color deficiency—no treatment is needed, because you function normall



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