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Pattern visual evoked potentials in traumatic optic neuropathy
Mitsuya Ikejiri1, Emiko Adachi-Usami, Atsushi Mizota
1Department of Ophthalmology and Visual Science, Graduate School of Medicine, Chiba University, Chiba, Japan. ikejiri@ophthalm.m.chiba-u.ac.jp
Summary
Pattern visual evoked potentials (PVEPs) were less recordable and showed lower amplitude ratios in traumatic optic neuropathy (TON) compared to optic neuritis (ON). This suggests distinct PVEP characteristics for diagnosing optic nerve damage.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Electrophysiology
Background:
- Traumatic optic neuropathy (TON) and optic neuritis (ON) are leading causes of vision loss.
- Distinguishing between TON and ON is crucial for appropriate management and prognosis.
- Pattern visual evoked potentials (PVEPs) are a non-invasive tool to assess optic nerve function.
Purpose of the Study:
- To compare PVEP characteristics between patients with TON and ON.
- To identify potential differences in PVEP parameters that could aid in differential diagnosis.
Main Methods:
- Retrospective study of 47 patients with TON and 64 patients with unilateral ON.
- PVEPs were recorded using 3 reversals/s stimulation.
- Analysis of PVEP recording rates, amplitude ratios (affected/fellow eye), and peak latency delays.
Main Results:
- PVEPs were recordable in 29.8% of TON patients vs. 49.6% of ON patients.
- Mean amplitude ratio was significantly lower in TON (0.29) compared to ON (0.48).
- Mean peak latency delay was 17.9 ms in TON and 23.5 ms in ON.
Conclusions:
- PVEP recording is less frequent in TON than ON.
- Lower amplitude ratios in PVEPs are characteristic of TON, suggesting more severe axonal damage.
- PVEP analysis can help differentiate between traumatic and inflammatory optic neuropathies.