The preoperative, intraoperative, and postoperative data will be collected for each patient. These demographics and clinical findings include age, gender, study eye, types and duration of diabetes mellitus, systemic diseases such as hypertension, renal insufficiency (24 hours creatinine clearance estimated by Cockcroft and Gault equation), degree of intraoperative bleeding, duration of the surgery, combined lens extraction, and the use of scleral buckle. Data regarding the extent of preretinal blood in the first postoperative day; time, duration, frequency and treatment of recurrent vitreous hemorrhage; and the duration of postoperative follow-up will also be compiled. Results of ophthalmological examinations, including best corrected visual acuity, intraocular pressure, and lens status will be recorded.