It is a rare congenital stationary cone dysfunction syndrome, affecting less than 1 in 100,000 individuals, and is characterized by the absence of L- and M-cone function. BCM results from mutations in a single red or red–green hybrid opsin gene, mutations in both the red and the green opsin genes or deletions within the adjacent LCR (locus control region) on the X chromosome. Green cone monochromacy (GCM), also known as M-cone monochromacy, is a condition where the blue and red cones are absent in the fovea. The prevalence of this type of monochromacy is estimated to be less than 1 in 1 million. Red cone monochromacy (RCM), also known as L-cone monochromacy, is a condition where the blue and green cones are absent in the fovea. Like GCM, the prevalence of RCM is also estimated at less than 1 in 1 million.Cone Monochromats with normal rod function can sometimes exhibit mild color vision due to conditional dichromacy. In mesopic conditions, both rods and cones are active and opponent interactions between the cones and rods can afford slight color vision.According to Jay Neitz, a color vision researcher at the University of Washington, each of the three standard color-detecting cones in the retina of trichromats can detect approximately 100 gradations of color. The brain can process the combinations of these three values so that the average human can distinguish about one million colors. Therefore, a monochromat would be able to distinguish about 100 colors. Mammals
Until the 1960s popular belief held that most mammals outside of primates were monochromats.
Labour or labor may refer to:

Childbirth, the delivery of a baby
Labour (human activity), or work
Manual labour, physical work
Wage labour, a socioeconomic relationship between a worker and an employer
Organized labour and the labour movement, consisting principally of labour unions
The Labour Party (UK)

Literature
Labor (journal), an American quarterly on the history of the labor movement
Labour/Le Travail, an academic journal focusing on the Canadian labour movement
Labor (Tolstoy book) or The Triumph of the Farmer or Industry and Parasitism (1888)

Places
La Labor, Honduras
Labor, Koper, Slovenia

Other uses
Labor (album), a 2013 album by MEN
Labor (area), a Spanish customary unit
"Labor", an episode of TV series Superstore
Labour (constituency), a functional constituency in Hong Kong elections
Labors, fictional robots in Patlabor

People with the surname
Earle Labor (born 1928), professor of American literature
Jérémy Labor (born 1992), French footballer
Josef Labor (1842–1924), Austrian musician and composer

See also
Labor Day (disambiguation)
Labour law
Labour Party (disambiguation)
Work (disambiguation)
All pages with titles beginning with Labour
All pages with titles containing Labour
All pages with titles beginning with Labor
All pages with titles containing Labor