The visually evoked potential (VEP) elicited by pattern response is used to assess the visual acuity of preverbal infants in research situations, but few reports indicate the percentage of patients successfully completing the tests (testability). Data are presented to illustrate the testability of acuity assessed by VEPs with clinical populations of preverbal and neurologically handicapped children. 166 referrals in a 9-month period to an electrodiagnostic clinic indicated that 75% of the referrals less than 3 years old, and 87% of the neurologically handicapped referrals were testable. The testability of VEP acuity is as great or greater than other procedures for examining the visual functions of non-verbal or unco-operative patients.
The electro-oculogram has been applied in the diagnostic evaluation of eyes with malignant uveal melanoma. Typically, a marked reduction in the light peak to dark trough ratio has been reported. We studied two patients with histologically confirmed uveal malignant melanomas in whom the preenucleation electro-oculograms were normal. The electro-oculogram should be evaluated within the framework of the clinical examination and other ancillary tests in the diagnostic evaluation of a suspected uveal malignant melanoma.
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