Objective: To study the clinical significance of intravitreal injection of triamcinolone acetonide( TA) before pars plana vitrectomy( PPV) in patients with proliferative diabetic retinopathy( PDR). Methods: 56 patients with PDR treated in the First Affiliated Hospital of Zhengzhou University were involved and divided into two groups. 30 eyes( group A) were treated with TA for 4 to 14 days before PPV,and another 26 eyes( group B) underwent PPV without TA. Postoperative corrected visual acuity,intraoperative ...