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７６例（８２只眼）视网膜分支静脉阻塞（ｂｒａｎｃｈｒｅｔｉｎａｌｖｅｉｎｏｃｃｌｕｓｉｏｎ，ＢＲＶＯ）和８２例（８只眼）无ＢＲＶＯ的眼底彩色照片和眼底荧光血管造影片显示：ＢＲＶＯ多发生于颞侧（９０．３％），尤其是颞上象限（５４．９％）。在阻塞处，有静脉后位交叉（ｖｅｉｎ－ｐｏｓｔｅｒｉｏｒｃｒｏｓｓｉｎｇ，Ｖ－Ｐｃ）者为１００％（８２／８２）；而在３个不同对照组的动－静脉交叉（ａｒｔｅｒｉｏｖｅｎｏｕｓｃｒｏｓｓｉｎｇ，Ａ－Ｖｃ）处，Ｖ－Ｐｃ分别为：Ｂ组６７．１％（５５／８２），Ｃ组７０．０％（４９／７０），Ｄ组７４．４％（６１／８２）。阻塞组与三个对照组分别进行比较，差异均有显著性（Ｐ＜０．００１）。提示Ｖ－Ｐｃ可能是ＢＲＶＯ的主要危险因素；动脉对静脉的机械压迫可能是ＢＲＶＯ的主要原因之一。
BRVO and 82 (8 eyes) BRUS-free fundus fluorescein and fundus fluorescein angiograms showed that BRVO occurred mostly in the temporal side (90.3%) in 82 eyes (82 eyes) , Especially the superior temporal quadrant (54.9%). There were 100% (82/82) patients with vein-posterior cross-clamping (V-Pc) at the occlusion site. In the arteriovenous cross-over (A-Vc) -Pc were 67.1% (55/82) in group B, 70.0% (49/70) in group C, and 74.4% (61/82) in group D. Obstructive group compared with the three control groups, the difference was significant (P <0.001). It is suggested that V-Pc may be the main risk factor of BRVO. Arterial venous mechanical compression may be one of the main causes of BRVO.