Fig. 3. Changes of central macular thickness (CMT) after epiretinal membrane surgery. Group Ⅰ includes patients who went vitrectomy only and group Ⅱ includes patient who went vitrectomy with sulfur hexafluoride (SF6) tamponade. CMT consistently decreased after surgery in both groups. Two groups did not show significant differences of CMT at baseline and during the follow-up period. *Significant differences compared with baseline within the group, Wilcoxon Signed Rank test.