Fig. 2

Correlations between the flicker ERGs and ages. a: The amplitudes of the flicker ERGs of all three groups recorded with the RETeval™ system were not correlated with the ages (r = −0.078, P = 0.59, n = 52; Pearson correlation coefficient). b: The implicit times of the flicker ERGs of all three groups were also not correlated with the ages (r = 0.095, P = 0.51, n = 52; Pearson correlation coefficient)