Sanborn G E, Magargal L E
Ophthalmology. 1984 Dec;91(12):1616-26. doi: 10.1016/s0161-6420(84)34111-2.
Hemispheric retinal vein occlusions involve the venous return from approximately one-half of the retina and have characteristics of both central retinal vein occlusions and branch retinal vein occlusions. One hundred six such occlusions were studied in 104 patients whose average age was 66 years. The site of the hemispheric vein occlusion was located in a branch retinal vein in 90% of the eyes, and in 10% of the eyes it was located in one of the dual intraneural trunks of the central retinal vein. Of these eyes, 11% developed neovascularization of the disc, 9% developed neovascularization of the retina elsewhere, 9% developed neovascularization of the iris, and 3% developed neovascular glaucoma. Neovascularization was positively correlated with an increasing percentage of capillary nonperfusion (ischemic index) within the area of occlusion. Prophylactic argon laser treatment was effective in reducing the incidence of neovascularization in eyes with significant capillary nonperfusion.
半球性视网膜静脉阻塞累及视网膜约一半区域的静脉回流，具有视网膜中央静脉阻塞和视网膜分支静脉阻塞的特征。对104例平均年龄为66岁患者的106次此类阻塞进行了研究。90%的患眼半球性静脉阻塞部位位于视网膜分支静脉，10%的患眼位于视网膜中央静脉的双神经内干之一。在这些患眼中，11%发生视盘新生血管形成，9%在其他部位的视网膜发生新生血管形成，9%发生虹膜新生血管形成，3%发生新生血管性青光眼。新生血管形成与阻塞区域内毛细血管无灌注百分比（缺血指数）增加呈正相关。预防性氩激光治疗可有效降低毛细血管无灌注明显的患眼新生血管形成的发生率。
