Previous studies have confirmed that foveal avascular zone (FAZ) enlargement is correlated with visual acuity impairment in patients with retinal vein occlusion (RVO). This current study aimed to evaluate the OCT angiography parameters: the area of FAZ, foveal and parafoveal vascular density (VD), and foveal and parafoveal thickness. They also assessed the correlation of superficial and deep capillary plexuses (SCP, DCP) using OCT angiography with visual acuity in eyes with RVO. Thirty-three RVO (21 BRVO, 12 CRVO) and 33 control eyes were imaged. The area of superficial FAZ in eyes with RVO was marginally larger than that in fellow eyes (P = 0.054), and the area of deep FAZ in eyes with RVO was significantly larger than that in fellow eyes (P=0.033). This result showed that the superficial and deep foveal VDs were not significantly different among eyes with RVO, fellow eyes and control eyes. The superficial and deep parafoveal VDs in eyes with RVO were significantly lower than those in fellow eyes and control eyes. It was also observed that the area of superficial FAZ was positively correlated with BCVA (logMAR), and the superficial and deep parafoveal VDs were negatively correlated with BCVA (logMAR).