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Timing of the Electroretinogram Response and Dark Adaptation

Published online by Cambridge University Press:  18 September 2015

Jean Real Brunette  and
Gilles Lafond
Jean Real Brunette*
Affiliation:
Laboratoire de Physiologie Visuelle, Department of Ophthalmology, Université de Montreal, Montréal, Canada
Gilles Lafond
Affiliation:
Laboratoire de Physiologie Visuelle, Department of Ophthalmology, Université de Montreal, Montréal, Canada
*
c/o Dept. of Ophthalmology, Centre Hospitalier Universitaire, De Sherbrooke, Sherbrooke, Quebec J1H 5N4 Canada.
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Summary:

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The time response of the Electroretinogram (ERG) is an essential part of the examination. Peak time ofresponse increases with dark adaptation and decreases with the intensity of stimulation. When working with constant amplitude during dark adaptation sensitivity increases but the intensity of stimulation decreases. It is essential to clarify the relationship of these two factors for valid interpretation of results. The present work suggests that the state of adaptation or retinal sensitivity affects amplitude, while peak time of the response is modified by the absolute value of the stimulating source whatever the state of adaptation. This observation has been done on rod responses and is valid as long as pigments remain unbleached and able to respond.

Type
Research Article
Information
Canadian Journal of Neurological Sciences , Volume 5 , Issue 2 , May 1978 , pp. 179 - 182
Copyright
Copyright © Canadian Neurological Sciences Federation 1978

References

REFERENCES

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