Ans. B: Vitreous defects The 3 most common causes of vitreous hemorrhage are: Proliferative diabetic retinopathy Posterior vitreous detachment (PVD) with or without retinal tears Ocular trauma (e.g., shaken baby syndrome); together these account for 60-89% of all cases. Less common causes include branch or central retinal vein occlusion, proliferative sickle cell retinopathy, retinal microaneurysm, age-related macular degeneration, and subarachnoid hemorrhage (Terson syndrome).