Electroretinographic profile in emmetropic Singaporean eyes.
OBJECTIVE
To characterise the electroretinographic (ERG) profile in 70 Singaporean emmetropic eyes.


METHODS
Seventy eyes of thirty-five patients with refractive error of -1.00D or less and with a normal ophthalmic examination were chosen. They were subjected to three flash patterns generated with a Nihon-Kohden Flash Stimulator. The results were captured on a Nihon-Kohden Neuropack 8.


RESULTS
The mean age of the patients was 25 years (range 20 to 30). The mean spherical refractive error was -0.3D (range 0D to -1.00D). For the scotopic dim flash, the mean amplitude for the 'b' wave was 304.6 +/- 69.2 mu v (range 175 mu v to 469 mu v) and the mean latency was 47.56 +/- 4.87 ms (range 41.2 ms to 62.0 ms). For the scotopic bright flash, the mean amplitude for the 'b' wave was 469.54 +/- 127.15 mu v (range 257 mu v to 750 mu v) and the mean latency was 40.54 +/- 3.91 ms (range 32.0 ms to 48.9 ms). In the flicker response, the mean amplitude for the 'b' wave was 34.19 +/- 12.97 mu v (range 14 mu v to 64 mu v) with mean latency at 34.46 +/- 0.58 ms (range 33.1 ms to 35.9 ms).


CONCLUSIONS
With ERG normal values so generated, comparisons with these can then be made for abnormal cases.
Yong
V K
VK
Department of Ophthalmology, National University Hospital, Singapore.
Wee
T L
TL
D000221:Adaptation, Ocular / Q000502:physiology; D000328:Adult; D003623:Dark Adaptation / Q000502:physiology; D004596:Electroretinography; D005260:Female; D005425:Flicker Fusion / Q000502:physiology; D006801:Humans; D008297:Male; D009216:Myopia / Q000145:classification; D010775:Photic Stimulation; D011446:Prospective Studies; D011930:Reaction Time; D012029:Refraction, Ocular / Q000502:physiology*; D012846:Singapore