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Ophthalmology. 1994 Feb;101(2):309-14.

Evoked potential analysis of visual pathways in human albinism.

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1
Ophthalmic Genetics and Clinical Services Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892.

Abstract

PURPOSE:

To explore the abnormal crossing of the retinogeniculate pathways in human albinos with visual-evoked potentials (VEPs).

METHODS:

The authors studied the symmetry of the topographic distribution of pattern onset/offset VEPs over the posterior part of the scalp elicited by monocular stimulation of each eye in 31 consecutive patients with different types of albinism.

RESULTS:

Twenty-one patients had asymmetric responses, with the major amplitude recorded over the lateral part of the scalp contralaterally to the stimulated eye in 14 patients and ipsilaterally in 7 patients. In two patients, the responses had a symmetric topographic distribution. In eight patients, the amplitude was so low that studying the symmetry was not possible.

CONCLUSIONS:

These findings demonstrate a non-uniform pattern of asymmetry as a result of the miswiring of the visual pathways in human albinism. Moreover, the low amplitude of the VEP recorded in a consecutive series of patients shows the difficulty of the study of this phenomenon in a clinical setting.

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PMID:
8115151
[Indexed for MEDLINE]
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