Figure 2.

Graphical presentation of the dynamic retinal vessel response profile displaying the parameters calculated and used in analysis: AU, arbitrary units; BDF, baseline diameter fluctuation calculated as the maximum range in vessel diameter during first 30 s of baseline readings; MD, maximum dilation; MD%, percent dilation calculated as the percentage change in vessel diameter from baseline to maximum following onset of flicker; DA, dilation amplitude (difference between MD and MC during flicker); MC, maximum constriction; MC%, percent constriction calculated as the percentage change in vessel diameter from baseline to maximum following end of flicker.