Figure 3  .

75 Percentile flow in HRF neuroretinal rim measurements (mean (SE)). 75 percentile flow = blood flow values at 75 percentile pixels of blood flow histogram, which is generated from acceptable DC pixels (DC: from 70 to 200). Method 1: a conventional setting which has the optic nerve head in the centre of the image with photodetector sensitivity optimised for the strong signal from the temporal peripapillary retina. Method 2: the setting of method 1 with signal capturing optimised on the rim by increasing sensitivity. Method 3: the setting of method 2 with the temporal rim margin tangent to the lateral image border. *Significant difference between methods 2 and 3 (p=0.0065, Wilcoxon signed rank test).