Color blindness is quite common, approximately 8% of the male population is affected. Color blindness, or color vision deficiency, is the inability to see colors or notice color differences under normal light. Color blindness can change a person's life. It can make reading and learning more difficult, and some careers are not available (Williams, 2010). The most common case of color blindness is a sex-related condition. This is caused by an error in the development of the retinal cones that distinguish color in light and transfer it to the optic nerve. Sometimes a person may acquire color blindness due to aging, eye problems, injury, or a side effect of a medicine. Color blindness has been around for a while. John Dalton, an English chemist, was the first to report the disorder. He wrote the first scientific article on color blindness in 1798. The first general condition of color blindness was called color blindness. Since both he and his brother were color blind, he realized that this condition must be hereditary. Dalton believed that the reason for color blindness is a colored liquid inside the eyeball, which acts like a colored shield surrounding the eyeball. Before Dalton died, one of his last wishes was to get an autopsy of his eyes after death. Scientists dissected his eye and found no colored liquid. Although Dalton's theory lost credibility during his lifetime and was disproven after his death, Dalton was the first to recognize color vision problems (Wearecolorblind, 2012). After John Dalton's theory was disproved, two men named Thomas Young and Hermann von Helmholtz were the first to propose trichromatic color vision. Once the theory was developed, it wasn't long after the basics were learned. In 1802, Young suggested that there were… mid-paper modified cells that protected against HIV. The gene therapy revolution. 12. Retrieved March 25, 2014, from io9Evans, A. (2008). Color is in the eye of the beholder. Boston, Massachusetts: CVDPublishing. Kennard, J. (2007, January 7). Color blindness in men. Men's health. Retrieved February 10, 2014, from About.MensHealth: MensHealth.about.comMedicineNet. (2012, May 14). Color blindness. Retrieved February 9, 2014, from MedicineNet: MedicineNet.comPhillips, R.H. (1995). Addressing color blindness (Vol. 1). New York City, New York: Avery.Wearecolorblind. (2012, January 10). An introduction to color blindness. Retrieved February 9, 2014, from Wearecolorblind: Wearecolorblind.comWebMD. (2011, April 2011). Eye health care. Retrieved February 9, 2014, from WebMD.comWilliams, P. (2010). Colorblind: A memoir. New York City, New York: St. MartinsPres.