Related Experiment Videos
[Increase in the amplitude of the b-wave of the cone electroretinogram during light adaptation]
1Elektroretinografie Laboratorium, Augenklinik Universitätsspital, Zürich, Schweiz.
Background:
In experimental and in clinical electrophysiology, cone electroretinograms (ERG) undergo typical changes of the b-wave during the course of light adaptation.
Methods And Results:
B-Waves obtained from twenty healthy subjects, exposed to a rod-desensitizing adapting field for ten minutes show an increase of amplitude. This increase was observed using a short wavelength as well as with a long wavelength stimulus. The cone ERG implicit times decrease slightly during light adaptation.
Conclusions:
To avoid considerable variation in clinical cone-ERG it is necessary to wait a certain period of time before measuring cone b-waves and comparing them with normative values. Possible mechanisms underlying these adaption-induced ERG changes are discussed.