[The effect of stimulus intensity and background luminance on the b-wave implicit time of photopic electroretinogram in normal human eyes].
The authors studied the effect of stimulus intensity and background luminance on the b-wave implicit time of photopic electroretinogram in normal human eyes. Photopic electroretinograms were recorded at various stimulus intensities and background luminances in the range of 2.5 log scale using an integrating sphere of 30 cm diameter in the first experiment. The results from two normal eyes showed that with increasing stimulus intensity or with decreasing background luminance the b-wave implicit time of photopic electroretinogram prolonged and one or three wavelets superimposed on the ascending limb of the b-wave. The second experiment was performed using a half dome sphere of 60 cm diameter to study the b-wave implicit time at three different stimulus intensities. The results from 30 normal eyes disclosed a statistically significantly longer implicit time at the greater stimulus intensities. These results suggest that b-wave implicit time in photopic electroretinogram becomes delayed with increasing stimulus intensity and becomes shorter with brighter background luminance.
Yamaguchi
S
S
Department of Ophthalmology, Yamanashi Medical College, Japan.
Iijima
H
H
Hosaka
O
O
D000328:Adult; D004596:Electroretinography / Q000379:methods; D005260:Female; D006801:Humans; D008029:Lighting; D008297:Male; D009799:Ocular Physiological Phenomena; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time