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Flash visual evoked potentials (FVEP) in various stimulation conditions
Author(s) -
POJDAWILCZEK D
Publication year - 2014
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2014.2442.x
Subject(s) - stimulation , medicine , latency (audio) , audiology , evoked potential , telecommunications , computer science
Purpose Comparison between the results of FVEP examinations conducted with various stimulators (Ganzfeld, Mini Ganzfeld i Flash Goggles) as well as for opened and closed eyes. Methods 17 volunteers (34 eyes), including 11 females, aged 23‐56 (average age: 30 years) have been examined with Roland Consult electrophysiological equipment. Basing on Wilcoxon signed‐rank test the amplitude and the latency of P2 wave have been compared: 1. of results acquired with each of three stimulators; 2. of results acquired with eyes opened and eyes closed. Results Mean P2 amplitude (latency) acquired with Ganzfeld stimulation amounted to 12 µV (130 ms), acquired with Mini Ganzfeld stimulation amounted to 7 µV (124 ms) and acquired with Flash Goggles amounted to 9 µV (113 ms). The results statistically significantly differed (p < 0,0001) between all compared stimulators. Mean P2 amplitude (latency) acquired with Ganzfeld stimulation amounted to 12 µV (130 ms), acquired with Mini Ganzfeld stimulation amounted to 7 µV (124 ms) and acquired with Flash Goggles amounted to 9 µV (113 ms) with eyes opened and accordingly 11 µV (131 ms), 9 µV (126 ms) and 6 µV (120 ms) with eyes closed. The results for eyes opened and eyes closed statistically significantly differed (p < 0,001) for Mini Ganzfeld as well as for Flash Goggles stimulators. Conclusion The amplitude and latency of P2 FVEP acquired with different stimulators cannot be compared. Keeping eyes closed does not significantly alter the amplitude and latency of P2 FVEP only in case of Ganzfeld stimulation. The results acquired with other stimulators can be faulty if the patient closed eyes during examination.