Surgery is the most effective treatment of rhegmatogenous retinal detachment(RRD)which is the most common type of retinal detachment. Nowdays, the postoperative retinal anatomic reattachment is evaluated by indirect ophthalmoscope, optical coherence tomography(OCT), ocular ultrasonography and etc. which are also helping ophthalmologist in diagnosis of RRD. Postoperative visual function is mainly confirmed by the best corrective visual acuity(BCVA), which is mostly chosen by ophthalmologist in prognosis evaluation. However, there were patients with terrific postoperative retinal anatomic reattachment, who should have achieved the BCVA. The factors and the probable mechanism which affect the postoperative visual function of RRD would be summarized in this paper.