ELECTRORETINOGRAPHY BY SKIN ELECTRODES AND SIGNAL AVERAGING METHOD

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Abstract
ERG is invaluable for the investigation of suspected visual disorders. A simplified method for clinical electroretinography by non-corneal electrodes is presented. The latency and amplitude values were measured in 22 normal subjects. Using skin electrodes and signal averaging, an electroretinogram can be recorded with a waveform and time relations similar to those obtained by corneal electrodes without discomfort to the patient. Non-corneal ERG is useful for infants, children and sensitive adult patients. It is applicable after recent eye surgery and in cases of infection or injury of the anterior segment. Since non-corneal electrodes do not obstruct the stimulus light or cause refractive change, they are advantageous when ERG is recorded simultaneously with visually evoked cortical response (VER). When stimulating only 1 eye at a time in flash VER is important, the adequacy of the cover is verified by the absence of an ERG from the covered eye.