[Quantitative evaluation of flicker ERG wave forms in low vision patients].
Flicker ERGs of 30 Hz were recorded for 46 eyes (23 cases) of low vision, including 38 eyes with retinal diseases and 8 eyes with optic neuropathy, and also for 39 normal eyes. The abnormality ratios were compared with regard to (1) the directly measured peak to peak amplitude and pseudo-phase, and (2) the amplitude and phase of fundamental response component (30 Hz) by discrete Fourier transform (DFT). All eyes with optic neuropathy showed normal flicker ERG, while the abnormality ratios of the directly measured pseudophase and the phase by DFT were 60.9% in 28 eyes and 82.6% in 38 eyes with retinal diseases respectively, the difference being statistically significant (P less than 0.05). These findings suggest that DFT for flicker ERG is more useful in quantitative evaluation of the retinal function.
Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou.
D Z
DZ
Wu
D000293:Adolescent; D000328:Adult; D002648:Child; D004596:Electroretinography / Q000379:methods; D005260:Female; D005425:Flicker Fusion; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009901:Optic Nerve Diseases / Q000150:complications; D010775:Photic Stimulation; D012160:Retina / Q000503:physiopathology*; D012164:Retinal Diseases / Q000150:complications; D015354:Vision, Low / Q000209:etiology / Q000503:physiopathology*