Efficacy of vitrectomy and internal limiting membrane removal for macular edema associated with branch retinal vein occlusion.

AIM: To compare the results of vitrectomy with internal limiting membrane (ILM) peeling to that without ILM peeling for macular edema associated with branch retinal vein occlusion (BRVO). METHODS: The medical records of 47 eyes of 47 patients with BRVO-associated macular edema were examined. To treat the macular edema, a posterior vitreous detachment (PVD) was created, and the ILM was removed in 13 eyes (ILM-removed group), whereas a PVD was created and the ILM was not removed in 34 eyes (ILM-preserved group). The best-corrected visual acuity (BCVA) and the optical-coherence-tomography-determined foveal thickness were obtained preoperatively and at 6 months postoperatively. RESULTS: The mean postoperative BCVA was significantly better than the preoperative BCVA in both the ILM-removed and in the ILM-preserved groups (p = 0.0017 and p = 0.0002, respectively). The fovea was significantly thinner at 1 month after surgery in both groups (p = 0.0007 and p < 0.0001, respectively). The postoperative improvement of the mean BCVA and the foveal thickness were not significantly different for the two groups at any postoperative period. CONCLUSIONS: Because there was no significant difference in the improvement of BCVA between the two groups at 6 months postoperatively, there may be no additional benefit in removing the ILM for BRVO-associated macular edema.