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The disorder can cause heart abnormalities and seizures if the amount of methemoglobin in the blood exceeds 20 percent, but at levels between 10 and 20 percent it can cause blue skin without other symptoms. Most of the Fugates lived long and healthy lives. The "bluest" of the blue Fugates, Luna Stacy, had 13 children and lived to age 84. [6]
Blue cone monochromacy (BCM) is an inherited eye disease that causes severe color blindness, poor visual acuity, nystagmus, hemeralopia, and photophobia due to the absence of functional red (L) and green (M) cone photoreceptor cells in the retina. BCM is a recessive X-linked disease and almost exclusively affects XY karyotypes.
Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye), a white forelock or patches of light skin.
An Ishihara test image as seen by subjects with normal color vision and by those with a variety of color deficiencies. The main method for diagnosing a color vision deficiency is in testing the color vision directly. The Ishihara color test is the test most often used to detect red–green deficiencies and most often recognized by the public. [1]
The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.
As humans typically exhibit three classes of cones, cone monochromats can hypothetically derive their photopic vision from any one of them, leading to three categories of cone monochromats: [4] Blue cone monochromacy (BCM), also known as S-cone monochromacy, is an X-linked cone disease. [ 5 ]
Hans Eiberg (born 8 April 1945) is a Danish geneticist, known for his discovery of the genetic mutation causing blue eyes.. Hans Eiberg graduated as a M.Sc. in 1970. He has worked with genetics at the Institute for Medical Biochemistry and Genetics of Copenhagen University since 1971, and became an associate professor at the institute in 1975.
Blue eye disease is caused by the porcine rubulavirus, which first emerged in 1980 throughout parts of Mexico, including La Piedad, Michoacan, Jalisco, and Guanajuato. The virus is transmitted directly and indirectly by fomites and birds and can be found throughout the body, including neurons and most soft tissues.