N. Mohidin et al., THE REPEATABILITY AND VARIABILITY OF THE MULTIFOCAL ELECTRORETINOGRAMFOR 4 DIFFERENT ELECTRODES, Ophthalmic & physiological optics, 17(6), 1997, pp. 530-535
Multifocal electroretinograms were recorded from twelve subjects on th
ree separate days using the Visual Evoked Response Imaging System (VER
IS), The subjects were 18-40 years-of-age. Each recording session was
separated by an interval of between one and 16 weeks. Four electrode t
ypes were compared: the JET contact lens electrode, the gold foil elec
trode, the DTL thread electrode and the carbon fibre (c-glide) electro
de, The b-wave amplitude density (nV/ sq.deg) recorded with each elect
rode was measured, The mean amplitude density recorded at each session
for each subject and each electrode was calculated and compared. Ther
e were no significant differences in amplitude density for the ERGs re
corded with each type of electrode over the three days. The coefficien
t of variation for each electrode and each subject was then calculated
using the results for the three days. The coefficients of variation f
or each electrode showed significant differences (One-way ANOVA: F= 4.
51, d.f. = 3, 44, P < 0.008). The c-glide electrode results had the hi
ghest variability and post hoc tests showed that its coefficient of va
riation was significantly different from those of the JET and gold foi
l electrodes but not from that of the DTL thread electrode. Copyright
(C) 1997 The College of Optometrists. Published by Elsevier Science Lt
d.