Objective To analyze the causes of non-traumatic vitreous hemorrhage and the therapeutic effect of vitrectomy. Methods From January 2015 to December 2015,229 patients( 243 eyes) hospitalized for non-traumatic vitreous hemorrhage were enrolled in the retrospective analysis. Cause compositions,surgical procedures and prognosis of patients with non-traumatic vitreous hemorrhage were analyzed respectively. Results Proliferative diabetic retinopathy( PDR,134 eyes,55. 56%),retinal vein occlusion( RVO,77 eyes,32. ...