Objective Assessment of Temporal Modulation Transfer Functions Using the Focal ERG
作者:
WILLIAM SEIPLE,
IRWIN SIEGEL,
RONALD CARR,
CHARLES MAYRON,
期刊:
American Journal of Optometry and Physiological Optics
(OVID Available online 1986)
卷期:
Volume 63,
issue 1
页码: 1-6
ISSN:0093-7002
年代: 1986
出版商: OVID
关键词: focal electroretinogram;temporal modulation transfer function;lock-in amplifier;retinal disease
数据来源: OVID
摘要:
Temporal modulation transfer functions (MTF's) were recorded from the macula of nine normal subjects using focal electroretinography (FERG). An array of light emitting diodes (LED's) was used to experimentally manipulate stimulus temporal frequency, modulation depth, and mean luminance values. Two techniques were used to derive FERG modulation thresholds at several temporal frequencies: conventional averaging with extrapolation to a criterion amplitude, and a swept stimulus lock-in retrieval method. These two methods produced comparable results. The electrophysiologically derived MTF's were similar in shape to those obtained psychophysically. Six patients with retinal disease were also examined; all patients showed sensitivity losses which were most marked at the higher frequencies. Such losses tended to be greater in patients with poorer visual acuity.
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