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Pattern-reversal visual evoked potentials in patients with epiretinal membrane
N A Bemelmans1, M A Tilanus, M H Cuypers
1Institute of Ophthalmology, University Hospital Nijmegen, The Netherlands.
American Journal of Ophthalmology
|January 1, 1997
Summary
Epiretinal membranes significantly alter pattern-reversal visual evoked potential (pVEP) parameters, showing prolonged latencies and reduced amplitudes. This suggests pVEP can help estimate macular function in affected eyes.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Electrophysiology
Background:
- Epiretinal membranes (ERMs) can affect visual function by distorting the macula.
- Pattern-reversal visual evoked potentials (pVEP) are used to assess the integrity of the visual pathway.
Purpose of the Study:
- To quantify pVEP parameter alterations caused by ERMs.
- To evaluate pVEP's utility in estimating macular function in ERM eyes and fellow eyes.
Main Methods:
- pVEP was recorded in 162 patients with ERMs (primary and secondary origins) and their fellow eyes.
- Stimuli included check sizes of 17', 10', and 7' (minutes of arc).
- Investigated parameters included N80 and P100 latencies and P100 amplitude.
Main Results:
- Eyes with ERMs showed significantly reduced visual acuity, prolonged N80/P100 latencies, and reduced P100 amplitude compared to fellow eyes.
- No significant differences in pVEP parameters were found between primary and secondary ERMs.
- Control group comparison confirmed ERM-related changes, particularly for larger check sizes.
Conclusions:
- ERMs lead to prolonged pVEP latencies and reduced amplitudes, indicating macular dysfunction.
- pVEP is a valuable tool for assessing macular function in the presence of ERMs.
- Further research is needed to correlate clinical and pVEP parameters.