Objective To explore the related risk factors of idiopathic macular epirentinal membrane(IM EM).Methods The clinical data was obtained from the first visit of 50 years of age or older residents of Shanghai area during the period from 2011 June to 2014 June in our hospital.All patients denied having a history of macular epirentinal membrane(ERM)history,and the ophthalmologic operation history,ocular trauma history and intraocular vascular inflammatory diseases were exclusived.A total of 295 cases(346 eyes) c...