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Amplitudenzunahme der b-Welle des Zapfen-Elektroretinogramms während Helladaptation

1994; Thieme Medical Publishers (Germany); Volume: 204; Issue: 05 Linguagem: Inglês

10.1055/s-2008-1045458

1439-3999

Ulrich H. Knobel, G. Niemeyer,

Receptor Mechanisms and Signaling

In experimental and in clinical electrophysiology, cone electroretinograms (ERG) undergo typical changes of the b-wave during the course of light adaptation.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.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.