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February 1980

Critical Frequency of Photic Driving in the Diagnosis of Multiple Sclerosis: A Comparison to Pattern Evoked Responses

Author Affiliations

From the Neurology and Research Services, Veterans Administration Wadsworth Medical Center, Los Angeles, and the Department of Neurology, University of California, Los Angeles (Drs Cohen, Syndulko, and Tourtellotte), and the Department of Biomedical Engineering, University of Texas, Arlington (Dr Potvin).

Arch Neurol. 1980;37(2):80-83. doi:10.1001/archneur.1980.00500510038005

• Patients with known or suspected multiple sclerosis (MS) were tested for abnormalities in visual evoked potentials. We compared the critical frequency of photic driving (CFPD) with pattern reversal visual evoked potentials (PVER). We found the CFPD to be somewhat more sensitive than PVER for detecting abnormalities in the visual pathways of patients with MS. When used together, the two were complementary, each finding abnormalities that the other missed. When evaluating patients with MS with evoked potentials, both PVER and CFPD should be tested.

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