[Characteristics of dark-adapted and light-adapted oscillatory potentials in human electroretinogram].
OBJECTIVE
To characterize dark-adapted and light-adapted oscillatory potentials (OPs) in human electroretinogram (EGR) elicited by flashing light stimulation of the same intensity.


METHODS
Dark- and light-adapted ERGs of normal eyes were studied. The frequency spectra of the extracted dark-adapted OPs and light-adapted OPs were analyzed by a fast Fourier transform. The peak frequency, latency and total power of the OPs were determined.


RESULTS
The averaged peak frequency, latency, and power of the dark-adapted OPs was 125.3∓9.93 Hz, 41.7∓3.56 ms, and 9.25∓5.55 (V·s)(2), as compared with 79.5∓6.79 Hz, 50.8∓5.36 ms, and 3.56∓2.18 (V·s)(2) for light-adapted Ops, respectively, showing significant differences in the parameters between dark- and light-adapted Ops (P<0.001).


CONCLUSIONS
Compared with dark-adapted OPs, light-adapted Ops is characterized by a lower peak frequency and a lower power with a prolonged latency.
Department of Ophthalmology, Chongqing Medical University, Chongqing, China. 190014370@qq.com
Juan-ping
JP
Yin
Bo
B
Lei
Hui
H
Peng
Jun
J
Wang
Xiao-nan
XN
Fu
D000221:Adaptation, Ocular / Q000502:physiology; D000328:Adult; D003623:Dark Adaptation / Q000502:physiology*; D004596:Electroretinography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D009991:Oscillometry; D012160:Retina / Q000502:physiology*; D055815:Young Adult