People with diabetic retinopathy may require vitrectomy surgery in an operating room setting. A vitrectomy is performed when there is bleeding or retinal traction that is causing loss of vision in  advanced diabetic retinopathy. In this surgical procedure, small instruments are inserted into the eye under microscopic visualization to remove the vitreous hemorrhage and any scar tissue . Endo-Laser photocoagulation may be performed during the surgery, and in some cases, a gas bubble or silicone oil may be injected  to hold the retina in position .The prognosis of vitrectomy surgery depends upon the status of the underlying diabetic retina.