Pars plana vitrectomy for vitreous hemorrhage and retinal vein occlusion.

We studied 16 cases of retinal vein occlusion and vitreous hemorrhage treated by pars plana vitrectomy. The visual acuity in all nine eyes suffering from branch vein occlusion was improved postoperatively, reaching an acuity of 6/6 to 6/12 in 33% of the patients. In the seven eyes suffering from central vein occlusion, however, the postoperative visual acuity results were poor. The incidence of postoperative complications was higher also in the central vein occlusion group.