Figure 4

Contour plots of the territory of macular edema with boundaries of deep capillary congestion at recurrence. Patients with chronic stable branch retinal vein occlusion experienced recurrence of macular edema (ME) from baseline. (a–c) Apexes of the ratio of an increased retinal thickness (RIRT) were in the capillary nonperfusion area (NPA) of the affected side. The other local maximums were in the foveal avascular zone (FAZ). Capillary congestion of the deep capillary plexus (DCP-C) surrounded the local apexes of RIRT. (d–f) Unlike the cases depicted in (a–c), the apexes of RIRT existed in the FAZ. Some DCP-C segments were not involved in ME. (g–i) Similar to the cases depicted in (d–f), the apexes of RIRT were in the FAZ. Most DCP-Cs existed on the border of ME territories, and in other DCP-Cs (h), ME has just emerged.