Figure 2.4.

Flicker light-induced increase in retinal microvascular diameters. (A) Shows where the increase in retinal arteriolar (red) and venular (blue) diameters in response to flicker light exposure can be assessed around the optic nerve head. (B) Shows that the baseline diameter is assessed during the first 50 seconds of the measurement and that during 40 seconds of flicker light the retinal diameter increases. The flicker light-induced increase in retinal diameters is calculated from the retinal diameter at 10 and 40 seconds.