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[Multifocal visually evoked responses in two children with optic neuritis].
Tetsuhisa Hatase1, Shigeru Hasegawa, Naoyuki Tanimoto
1Division of Ophthalmology and Visual Science, Graduate School of Medical and Dental Sciences, Niigata University, 1-757 Asahi-machi, Niigata 951-8510, Japan.
Nippon Ganka Gakkai Zasshi
|September 17, 2005
Summary
Multifocal visually evoked potentials (mVEP) reveal subtle optic nerve dysfunction in children recovering from optic neuritis, even after visual acuity normalizes. This indicates a more gradual visual recovery than standard tests suggest.
Area of Science:
- Ophthalmology
- Neuroscience
- Pediatrics
Background:
- Idiopathic optic neuritis in children can cause significant visual impairment.
- Assessing central visual function recovery is crucial for pediatric ophthalmology.
- Multifocal visually evoked potentials (mVEP) offer a detailed measure of visual pathway function.
Observation:
- Two young girls with unilateral optic neuritis presented with severe vision loss and visual field defects.
- Neurological and radiological assessments ruled out multiple sclerosis.
- mVEPs were recorded using a hexagonal stimulus pattern.
Findings:
- Reduced mVEP amplitudes persisted despite normalized visual acuity and visual fields after steroid treatment.
- mVEP amplitudes recovered gradually, approaching levels of the healthy eye over time.
- mVEP demonstrated persistent optic nerve dysfunction not detected by conventional tests.
Implications:
- Standard ophthalmological tests may underestimate the extent of visual recovery in pediatric optic neuritis.
- mVEP is a sensitive tool for detecting residual optic nerve dysfunction.
- This highlights the importance of advanced electrophysiological testing for comprehensive visual assessment in children.