Shiraki A, et al. - Investigators examined the data using wide-field optical coherence tomography angiography to research over the retinal nonperfusion in branch retinal vein occlusion. They noticed the mean area of retinal nonperfusion in the OCTA images, 81.0 ± 66.8 mm². They observed 84.7 ± 72.5 mm² and 184.1 ± 167.7 mm², the mean areas of retinal nonperfusion in fluorescein angiography (FA) and the total FA images, respectively. They also measured the mean vascular density (VD), 27.6 ± 3.5%, and the mean vascular length (VL), 12.4 ± 8.5%. A significant association of areas of retinal nonperfusion in FA and the total FA images with the VL was reported in separate regression analyses.