Measurement of the micro-electroretinogram and component analysis
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The authors propose a new technique for detecting micro-electroretinograms (μERG) which uses light-emitting diode (LED) stimulation and frequency analysis. The advantage of this method is the applicability of linear system analysis to a μERG obtained by partial stimulation of a computer-controlled waveform. The paper discusses two basic techniques for detecting the μERG. One is Fourier analysis of a synchronised ERG obtained by sine-wave stimulus, and the other is correlation analysis using a random stimulus. The results of the two methods are compared, and the usefulness of the proposed method is indicated; the μERG is analysed by means of a model consisting of five components of a second-order transfer function with delay. Functions of the central and peripheral areas of the retina could be analysed in more detail by this technique.
KeywordsCentral and peripheral areas of the retina Correlation technique Light-emitting diode Linear system analysis Micro-electroretinogram Random signal
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