Figures 3: a-b Schematic pictures of 40 % PRP density in the mid-periphery. a:Figures 3: a-b Panoramic FFA of the left eye of Patient 9 with a long duration between the diagnosis of NVG and achievement of PRP (33 months) in group I. He was referred to our hospital because of uncontrolled IOP in the left eye 31 months after the diagnosis of NVG. PRP density was increased by additional PRP from 20.0% (Figure 3a) to 61.1% (figure 3b), but IOP did not change before (41 mmHg) and after additional PRP (38 mmHg). Peripheral anterior synechia was not observed before and after achieving PRP. Insets of Figures 3a and b indicate schematic images of PRP densities. Defect areas of the mid periphery (colored grey) in Figure 3a and b insets are 1.98% and 0.21%, respectively.