Fig. 3

The ERG a-wave amplitudes obtained from the 6 subjects under the four conditions of D/N, D/H, B/N, and B/H. We use absolute value for displaying a-wave amplitude instead of actual corneal negative value. Filled circles regular data; filled diamonds the signal is not counted due to eye blinking or movement. The abscissa shows the timing sequence presented by the in-ordered number of stimuli