This is a retrospective, nationwide, multicentre study with retinal detachment (RD) in the Japan-RD registry between 2016 to 2017. The primary outcome was the estimated mean difference of postoperative corrected visual acuity (CVA) in six months and a propensity score matching the preoperative findings as covariates to adjust the confounders. Two thousand and ninety-seven cases met the criteria, 2042 had gas tamponade (GT) and 55 had silicone oil (SOT). Primary success was defined as a reattached retina with no tamponade at six months. Six months postoperatively, the mean best-corrected visual acuity (BCVA) in the GT group was 0.309 logMAR and in the SOT group was 0.671. The authors concluded that SOT should be used cautiously, and postoperative vision was worse in eyes treated once with SOT than with GT even after completely successful surgery. The limitations of this study include the retrospective observational nature, unmeasured confounding factors not having been adjusted and no information on optical coherence tomography was contained.