Figure 3: For each of the epochs examined (3a DC, 3b IC1, 3c IC2) figure 3 shows the mean and ± 2SE of the mean of the responses for the different groups (control, NTG and POAG) and for the 8 different response averages analyzed. In the DC and IC2 glaucoma patients differed significantly from the control. IC2 also demonstrated a significant effect of location.