Abstract: Objective To analyse the retrobulbar haemodynamic changes after vitrectomy in patients with rhegmatogenous retinal detachment (RRD). Methods Color Doppler flow imaging (CDFI) was used for measurement of blood flow velocities including peak systolic velocity (PSV), end diastolic velocity (EVD) and resistive indexes (RI) of the ophthalmic artery (OA), posterior ciliary arteries (sPCA) and central retinal artery (CRA) in 50 eyes of 50 patients with RRD. In them 22 eyes were filled with silicone oil, 28 eyes were filled with 12%C3F8 and 22 eyes were operated to remove silicone oil after filled with silicone oil for 2-4 months, and then CDFI parameters were obtained. The contralateral eyes were used as control eyes before and after the operation. Results There were no significant differences in CRA and sPCA, and PSV, EDV and RI before treatment between RD and OA eyes and control eyes (P＞0.05). PSV and EVD of CRA were significantly increased 3 months after surgery, RI were decreased significantly (P＜0.05). There were no significant differences in blood flow parameters of OA and sPCA before and after surgeries (P＞0.05). No changes were found in control eyes 3 months after surgery. Conclusion VRS might increase the velocity of CRA, decrease RI and improve ocular blood supply postoperatively.

Key words: retinal detachment, vitrectomy, ultrasonography, doppler, color, rhegmatogenous retinal detachment, pars plana vitrectomy surgery