<prompt> Most common cause of ruheosis iridis ?TumorCRAORadiation retinopathyDiabetic retinopathy  <response>: Ans. is d i.e., Diabetic retinopathy Causes of rubeosis iridis neovascularization of iris Common :- Diabetic retinopathy most common cause, central retinal vein occlusion, Eales disease, sickle-cell retinopathy. Rare causes :- Long standing retinal detachment, central retinal aery occlusion, intraocular inflammation uveitis, intraocular tumors choroidal melanoma, retinoblastoma, radiation retinopathy, ocular ischemic syndrome carotid aery disease, carotid-cavernous fistula. 