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Albinism is a congenital condition characterized in humans by the partial or complete absence of pigment in the skin, hair and eyes. Albinism is associated with a number of vision defects, such as photophobia, nystagmus, and amblyopia. Lack of skin pigmentation makes for more susceptibility to sunburn and skin cancers.
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. [3]: 9
Oculocutaneous albinism type I or type 1A [1] is form of the autosomal recessive condition oculocutaneous albinism that is caused by a dysfunction in the gene for tyrosinase (symbol TYR or OCA1). The location of OCA1 may be written as "11q1.4–q2.1", meaning it is on chromosome 11 , long arm, somewhere in the range of band 1, sub-band 4, and ...
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Eye color is primarily determined by the amount and distribution of melanin within the front part of the iris—the colored part of the eye. This pigment's concentration and arrangement is what ...
Ocular albinism is a form of albinism which, in contrast to oculocutaneous albinism, presents primarily in the eyes. [1] There are multiple forms of ocular albinism, which are clinically similar. [2]: 865 Both known genes are on the X chromosome.
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Ocular albinism type 1 (OA1) is the most common type of ocular albinism, with a prevalence rate of 1:50,000. [1] [2] It is an inheritable classical Mendelian type X-linked recessive disorder wherein the retinal pigment epithelium lacks pigment while hair and skin appear normal.