​Deuteranopia

Deuteranopia is the color deficiency in which the cones sensitive to medium wavelengths are missing (Fluck, 2014). This means they only have functioning blue and red cones (The University of Arizona, 2015). With normal color vision, an individual can distinguish between seven hues. However, with deuteranopia, one can only distinguish 2 to 3 hues. A deuteranope perceives short wavelength light as blue and long wavelength light as yellow. Where the individual perceives gray is referred to as the neutral point, which is at 498nm (Goldstein, 2010). Deuteranopia affects approximately 1% of men and 0.1% of the women (Fluck, 2014).