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Abnormal Electroretinograms and Visual Evoked Potentials in Chronic Papilledema Using Time-Difference Analysis

Published online by Cambridge University Press:  18 September 2015

T.H. Kirkham  and
S.G. Coupland
T.H. Kirkham*
Affiliation:
McGill University Departments of Ophthalmology, Neurology and Neurosurgery and the Department of Neuro-Ophthalmology at the Montreal Neurological Hospital
S.G. Coupland
Affiliation:
McGill University Departments of Ophthalmology, Neurology and Neurosurgery and the Department of Neuro-Ophthalmology at the Montreal Neurological Hospital
*
3801 Université, Suite 201, Montréal, Québec, Canada H3A 2B4
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Summary:

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Visual function is usually considered to be normal in papilledema. We report previously undescribed abnormalities in the electroretinograms (ERG) and visual evoked potentials (VEP) of two patients with chronic papilledema. The steady-state latencies of the ERG and VEP were calculated using time-difference analysis. The ERG was abnormal under both scotopic (slow) and photopic (fast) flicker conditions, but the VEP was abnormal only to fast flicker photopic stimulation. This may indicate a relative vulnerability of a high frequency signal system under conditions of raised intracranial pressure. The abnormalities resolved rapidly once the intracranial pressure had been normalised. The cause of the V EP and particularly the ERG abnormalities remains unknown.

Type
Research Article
Information
Canadian Journal of Neurological Sciences , Volume 8 , Issue 3 , August 1981 , pp. 243 - 248
Copyright
Copyright © Canadian Neurological Sciences Federation 1981

References

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