Figure 2. Electroretinographic amplitude measurements in albino and pigmented rats. Averaged data (mean±SEM) of ERG amplitudes versus stimulus intensities both from control albino (A, C; n=6) and pigmented rats (B, D; n=8) is shown for the right eye (open symbols) and left eye (filled symbols). A, B: Positive scotopic threshold response (circles) and negative scotopic threshold responses (triangles). C, D: Triangles correspond to the a-wave amplitude and circles correspond to the b-wave amplitudes. When the amplitudes obtained from the albino group were compared to those of the pigmented, there were no significant differences (t-test; p>0.05) for any of the waves analyzed, except the pSTR (t-test; p<0.05).