• X-linked ocular albinism can be an unsuspected cause of congenital nystagmus in blacks. In this study, eight of ten black ocular albinos from two kindreds had nonalbinotic, moderately pigmented fundi and no transillumination of the iris. We refer to this paradoxical condition as "ocular albinism cum pigmento." The only constant ophthalmoscopic feature was a foveal hypoplasia. Biopsy of clinically normal skin to demonstrate giant pigment granules is the most accurate means of diagnosis.
O'Donnell FE, Green WR, Fleischman JA, Hambrick GW. X-linked Ocular Albinism in Blacks: Ocular Albinism Cum Pigmento. Arch Ophthalmol. 1978;96(7):1189–1192. doi:10.1001/archopht.1978.03910060023005
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