The pattern electroretinogram (PERG) with contralateral corneal reference.
The pattern electroretinogram (PERG) is a sensitive test for investigation of the proximal retina. For monocular recording, the contralateral corneal reference (CCR) electrode position has been suggested as a possible alternative to the conventional ipsilateral temporal reference (ITR). We therefore compared the effect of these electrode positions on 26 subjects (median age 45.5 years, IQR 24.5-61.5). The signals were recorded monocularly with DTL nylon fibre electrodes. The visual stimuli were high contrast 19' black-white checkerboard patterns, reversing 4 times/s. PERG responses obtained from the CCR gave larger amplitudes and the increase in amplitude was statistically significant (P < 0.001). Because the CCR signal is larger, new normative ranges must be established to avoid false negative results.
Aldebasi
Y H
YH
Department of Optometry and Vision Sciences, Cardiff University, P.O. Box 905, King Edward VII Avenue, Cardiff, Wales CF10 3YJ, UK.
Drasdo
N
N
North
R V
RV
Morgan
J E
JE
D000328:Adult; D000368:Aged; D004596:Electroretinography / Q000295:instrumentation / Q000379:methods / Q000592:standards; D006801:Humans; D008875:Middle Aged; D012016:Reference Values; D012160:Retina / Q000502:physiology*; D012680:Sensitivity and Specificity