Voluntary suppression of the multifocal electroretinogram.
Publication/Presentation Date
1-1-2004
Abstract
OBJECTIVE: To describe multifocal electroretinogram (mfERG) responses in 2 patients with nonorganic visual loss and in 11 eyes of 6 healthy persons who suppressed their mfERG responses.
DESIGN: Observational case series.
METHODS: The mfERG results were recorded in all individuals using the Veris Science 4.2 instrument. All subjects were instructed to adjust the hexagonal test pattern so that it was in best focus. A second mfERG was recorded subsequently in volunteers who attempted suppression with inattention and poor fixation and by adjusting the focus to greatest blur.
MAIN OUTCOME MEASURES: Amplitude and latency of mfERG responses.
RESULTS: Suppressed mfERGs in patients with nonorganic visual loss and healthy volunteers demonstrated reduced amplitude, especially centrally. Amplitude reduction was statistically significant in the postsuppression as compared with the presuppression recordings in wave forms N1 and N2. Statistically significant shortening of postsuppression implicit times of P1 and N2 waveforms also was demonstrated.
CONCLUSIONS: The mfERG responses may be suppressed voluntarily. Amplitude may be reduced. In contrast to most reported pathologic conditions, the implicit time is shortened.
Volume
111
Issue
1
First Page
169
Last Page
176
ISSN
0161-6420
Published In/Presented At
Vrabec, T. R., Affel, E. L., Gaughan, J. P., Foroozan, R., Tennant, M. T., Klancnik, J. M., Jr, Jordan, C. S., & Savino, P. J. (2004). Voluntary suppression of the multifocal electroretinogram. Ophthalmology, 111(1), 169–176. https://doi.org/10.1016/j.ophtha.2003.04.011
Disciplines
Medicine and Health Sciences
PubMedID
14711730
Department(s)
Department of Medicine
Document Type
Article