Monochromatic electroretinogram of deutan defect in the presence of intense red adaptation.

Monochromatic electroretinograms (ERGS) of deutans were recorded in the presence of intense red adaptation. The responses of some deutans were barely detectable or remarkably reduced, with the maximum response at the same wavelength (570-580 nm) as that under white adaptation. Those of other deutans showed a slight shift of the peak wavelength and the spectral pattern toward the shorter wavelength side although the amplitudes of the responses were much lower than those of normals under the same adaptation. These two types of change of spectral response patterns by intense red adaptation were investigated in relation to the anomaloscopic findings. The presence of the peak shift of the spectral pattern caused by red adaptation may depend on the degree of contribution of the green cone system to color vision in the deutan.