Abstract
Normalisation of the visual evoked potential (VEP) in patients with optic neuritis (ON) appears to be a rare phenomenon. However, although several workers have indicated that it can happen, they have not followed up with subsequent VEP tests to confirm how long the VEP latency of the affected eye remains in the normal range. To resolve this, 18 patients with a clinical diagnosis of acute unilateral ON were followed for 5 years with repeated VEP tests to determine if the latency of the P2 wave from affected eye could return to the normal range. Furthermore, in cases where the latency returned to normal, the length of time that it remained so was also assessed. The normal range for the latency of the P2 wave was determined by measuring VEPs from a group of 18 healthy control subjects with a similar age distribution to the patients. This established an upper limit of 115.9 ms. At presentation the mean P2 latency of the affected eyes of the patients was 140 ms with a standard deviation of 16 ms. In general, the VEP latencies remained constant over the period of the investigation. However two patients demonstrated a return to normal latencies but this was only temporary. Their latencies become prolonged again within 2 years. These results provide evidence that the delayed P2 latency observed in patients with ON can return to the normal range in a small percentage of cases. However, this improvement may spontaneously deteriorate once more as a result of further episodes of subacute demyelination.
Similar content being viewed by others
References
_ Halliday AM, McDonald WI, Mushin, J. Delayed visual evoked response in optic neuritis. Lancet 1972; i: 982–5.
Halliday AM, McDonald WI, Mushin J. Delayed patternevoked response in optic neuritis in relation to visual acuity. Trans Ophthalmol Soc UK 1973; 93: 315–24.
Halliday AM, McDonald WI, Mushin J. Visual evoked response in diagnosis of multiple sclerosis. Br Med J 1973; 4: 661–4.
Halliday AM, McDonald WI. Pathophysiology of demyelinating disease. Br Med Bull 1977; 33: 21–7.
Ebers GC. Optic neuritis and multiple sclerosis. Arch Neurolog 1985; 42: 702–4.
Asselman P, Chadwick DW, Marsden CD. Visual evoked responses in the diagnosis and management of patients suspected of multiple sclerosis. Brain 1975; 98: 261–82.
Matthews WB, Small DG. Serial recording of visual and somatosensory evoked potentials in multiple sclerosis. J Neorol Sci 1979; 40: 11–21.
Matthews WB, Small M. Prolonged follow-up of abnormal visual evoked potentials in multiple sclerosis. Evidence for delayed recovery. J Neurol Neurosurg Psych 1983; 46: 639–49.
Kriss A, Francis DA, Cuendet F, Halliday AM, Taylor DSI, Wilson J, et al. Recovery after optic neuritis in childhood. J Neurol Neurosurg Psych 1988; 51: 1253–8.
Frederiksen JL, Petrera J. Serial visual evoked potentials in 90 untreated patients with acute optic neuritis. Surv Ophthalmol 1999; 44(Suppl 1): S54–62.
Brusa A, Jones SJ, Kapoor R, Miller DH, Plant GT. Longterm recovery and fellow eye deterioration after optic neuritis, determined by serial visual evoked potentials. J Neurol 1999; 246: 776–82.
Evans DL, Goode DH. A flexible automated data acquisition system for ophthalmic electrophysiology. Aust Phys Eng Sci Med 1992; 15: 124–30.
Hawkes CH, Stow B. Pupil size and the pattern evoked visual response. J Neurol Neurosurg Psych 1981; 44: 90–1.
Celesia, CG, Kaufman DI, Brigell M, Toleikis S, Kokinakis D, Lorance R, Lizano B. Optic neuritis: A prospective study. Neurology 1990; 40: 919–23.
__ Hely MA, McManis PG, Walsh JC, McLeod JG. Visual evoked responses and ophthalmological examination in optic neuritis. A follow-up study. J Neurol Sci 1986; 75: 275–83.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hidajat, R.R., Goode, D.H. Normalisation of visual evoked potentials after optic neuritis. Doc Ophthalmol 106, 305–309 (2003). https://doi.org/10.1023/A:1022973100421
Issue Date:
DOI: https://doi.org/10.1023/A:1022973100421