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.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Vrabec TR,Affel EL,Gaughan JP,Foroozan R,Tennant MT,Klancnik JM Jr,Jordan CS,Savino PJdoi
10.1016/j.ophtha.2003.04.011subject
Has Abstractpub_date
2004-01-01 00:00:00pages
169-76issue
1eissn
0161-6420issn
1549-4713pii
S0161-6420(03)01027-3journal_volume
111pub_type
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