Intraoperative Application of Fluorescein Sodium Angiography in Vascular Retinopathy

Inclusion Criteria: * There is non-absorption vitreous hemorrhage in the target eye, which requires vitrectomy; * can follow up according to the time specified by the study; * Age ≥ 18 years old; * Accurate Humphrey visual field test can be performed after surgery; * Post-operative pupil dilation and clear media for laser photocoagulation, digital photography, and OCT scanning; Exclusion Criteria: * Active eyelid or accessory infection; * Medical, surgical, panomental laser, or macular laser treatment of the study eye in the past 12 months; * Brain disease, systemic immune system disease and other related medical history; * Preoperative blood pressure (blood pressure greater than or equal to 180/110 mmHg), blood glucose (recent (past 6 months) or ongoing poor diabetes control, ·glycated hemoglobin \> 10.0 mg/dl) poor control; * Patients with choroidal detachment and ciliary detachment before surgery; * Any systemic drug known to be toxic to the retina or associated with the risk of macular edema;Any prior eye conditions associated with the risk of macular edema; * History of food and drug allergy;