Parameters of electroretinogram have not been standardized due to variations in recording techniques. This seems to be the major problem in communication among hospitals and laboratories. Examination techniques such as illuminance and
amplification
as
well as representative recordings should be presented in literature for accurate and proper communication.
Full-field electroretinograms were obtained in 87 normal Korean subjects ( 65 males, 22 females) under controlled conditions. Testing protocols are a modification of those developed and used in Massachusetts Eye and Ear Infirmary ERG Infirmary
Ear
Infirmary ERG service of Harvard Medical School. Details of recording technique were written and representative waveforms were also shown in figures. Age-matched norms were given in tables, and for the purpose of clinical appplication, range of
values
was given for each group. As far as we know, this is the first report of full-field ERG parameters in normal Koreans tested by the MEEI ERG protocols.
@ES The ranges are as follows.
@EN 1. Degenerative full-field electroretinogram
1) For the dim blue flash ERG, the range of b-wave amplitude and implicit time were 60㎶-258 and 73msec -117msec, respectively.
2) For the scotopically-matched red flash ERG, the range of a-wave amplitude and implicit time were 19㎶-53㎶ and 16msec -28msec. The range of b-wave amplitude and implicit time were 99㎶-298 and 44msec -101msec, respectively.
3) For the white ERG, the range of a-wave amplitude and implicit time were 53㎶-288㎶ and 10msec -27msec. The range of b-wave amplitude and implicit time were 190㎶-650㎶and 39msec-48msec, respectively.
4) For the submaximal white ERG, the range of a-wave amplitude and implicit time were 123㎶-330㎶and 20msec, -22msec. The range of b-wave amplitude and implicit time were 212㎶-623㎶and 33msec-44msec, respectively.
5) For the 30 Hz fliker ERG, the range of amplitude and implicit time were 23㎶-96㎶ and 25msec -36msec, respectively.
2. Vascular full-field electroretinogram
1) For the bright flash ERG, the range of a-wave amplitude and implicit time were 163㎶-394㎶and 8msec-16msec. The range of b-wave amplitude and implicit time were 328㎶-607and 31msec-47msec, respectively.
2) For the absolute amplitude of oscillatory potentials, the range was 13.75㎶-47.75㎶For the oscillatory potentials amplitude/a-wave slope ratio, the range was 0.49-1.25.
3) For the mid-frequency fft amplitude, the range was 1.86㎶-6.67, and for the highfrequency fft amplitude, the range was 1.04㎶-7.59㎶.
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