| yellow mutant (ym) oculocutaneous a. |
an autosomal recessive form of oculocutaneous albinism, characterized by yellow hair, fair skin, and severe ocular abnormalities; the hair and skin are white at birth but become pigmented in infancy. The eyes are blue at birth and darken with age; nystagmus persists into adulthood; and from the age of 3 years, transillumination of the iris reveals a cartwheel effect. Pigmentation of the fundus is slight or absent and the macular reflex is absent or minimal. Called also Amish a. and xanthous a.
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