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Ophthalmology 1985-Nov

Brown oculocutaneous albinism. Clinical, ophthalmological, and biochemical characterization.

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R A King
R A Lewis
D Townsend
A Zelickson
D P Olds
J Brumbaugh

Ključne riječi

Sažetak

The clinical, ophthalmological, and biochemical characteristics of a 28-year-old black woman with brown oculocutaneous albinism were determined. Hair color was medium brown and skin color was light brown, and a faint tan developed with sun exposure. The irides were light brown in the central one-third, blue-gray in the peripheral two-thirds, and showed punctate and radial translucency. Visual acuity was 20/60 in the right eye and 20/100 in the left eye. There was a moderate pendular nystagmus, and previous surgeries had corrected an exotropia. The foveal reflex was muted, and the retinal pigment was reduced. Hairbulb tyrosinase activity was 1.75 pmoles/120 min/hairbulb, hairbulb glutathione content 0.83 nmoles/hairbulb, and urine excretion of 5-S-cysteinyldopa 174.9 ng/mg creatinine. Electron microscopy of hairbulb and skin melanocytes showed arrested melanosomal development. These findings suggest that there is a partial block in the distal eumelanin pathway in this form of albinism. The ophthalmological characteristics of six additional cases of this form of albinism are also presented.

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