[Adaptational changes in cone electroretinograms in man].
Changes of amplitude and implicit time of human cone electroretinogram (ERG) were studied during dark adaptation and succeeding light adaptation. Dark-adapted cone ERG was isolated by subtracting scotopic blue response from matched scotopic red response. The former represented the rod-mediated b-wave, while the latter consisted of both rod-mediated b-wave and cone-mediated b-wave or x-wave. The b-wave amplitude of dark-adapted cone ERG remained unchanged during dark adaptation, while the implicit time increased systematically, reaching a plateau. Light-adapted cone ERG was obtained by red stimulus lights under a bright background light. The amplitude of light-adapted cone ERG was markedly suppressed through dark adaptation but it recovered gradually during light adaptation, reaching the base line level. The implicit time was unchanged during light adaptation.
Iijima
H
H
Department of Ophthalmology, Yamanashi Medical College.
Yamaguchi
S
S
D000221:Adaptation, Ocular; D000328:Adult; D003623:Dark Adaptation / Q000502:physiology*; D004596:Electroretinography; D006801:Humans; D008297:Male; D010786:Photoreceptor Cells / Q000502:physiology*