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Electroretinographic profile in emmetropic Singaporean eyes
Objectives:
To characterise the electroretinographic (ERG) profile in 70 Singaporean emmetropic eyes.
Method:
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).
Conclusion:
With ERG normal values so generated, comparisons with these can then be made for abnormal cases.