Background: The foveal contour is asymmetrical in the horizontal optical coherence tomographic (OCT) images\r\nin idiopathic macula holes (IMHs) successfully closed by pars plana vitrectomy (PPV). The purpose of this study was\r\nto compare the parafoveal retinal contour after PPV followed by gas tamponade for IMHs to that after vitrectomy for\r\nrhegmatogenous retinal detachment (RRD).\r\nDesign: Retrospective study.\r\nParticipants: Eleven eyes of 11 IMH patients and 10 eyes of 10 RRD patients who underwent PPV.\r\nMethods: The internal limiting membrane (ILM) was stained with indocyanine green and peeled in the IMH group\r\nbut not in the RRD group. The postoperative retinal thickness was measured by spectral-domain OCT.\r\nMain outcome measures: The parafoveal thicknesses of the operated eyes were compared to the corresponding\r\nareas of the fellow un-operated eyes.\r\nResults: In the IMH group, the average postoperative thickness of the temporal sector was 312.6 �µm and that of\r\nthe corresponding area of the fellow eyes was 330.2 �µm (P <0.05). Similarly, the thickness of the nasal sector was\r\n362.6 �µm and that of the fellow eyes was 345.8 �µm (P<0.05). These differences were not observed in the RRD group.\r\nAdditional measurements showed that the inner retinal layer was thinner in the temporal retina and the outer retinal\r\nlayer was thicker in the nasal retina in the IMH group.\r\nConclusions: The postoperative asymmetrical foveal contour was observed in only the IMH group.\r\nthat these alterations were caused by procedures, such as ILM peeling, rather than the gas tamponade.
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