A 58-year-old woman with type 1 diabetes mellitus (duration 22 years, HbA1c 10.1%) and hypertension presents with sudden onset of floaters and blurred vision in the right eye. On examination, visual acuity is counting fingers at 1 meter. Dilated fundoscopy reveals extensive retinal hemorrhages, cotton-wool spots, venous beading, intraretinal microvascular abnormalities (IRMA), and a hazy view of the optic disc due to vitreous hemorrhage. No retinal detachment is visible. What is the most appropriate immediate intervention?