Most common cause of neovascular glaucoma ?

Ans. is 'a' i.e., Diabetes Neovascular glaucoma (Rubeosis iridis) It is a secondary angle closure glaucoma which results due to formation of neovascular membrane over the iris i.e., neovascularization of iris (rubeosis iridis). Causes of rubeosis iridis are :- Common :- Diabetic retinopathy (most common cause), central retinal vein occlusion, Eale's 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), Fusch's heterochromic iridocyclitis. In central retinal vein occlusion (CRVO), glaucoma manifests about 100 days after thrombosis of central vein, therefore, it is also called 100 days glaucoma. The most widely accepted theory for neovascularization is that the hypoxic retina produces diffusible angiogenic factor (VEGF) that stimulates new vessel proliferation. Treatment of choice is panretinal photocoagulation as it terminates the angiogenic stimulus for neovascularization of retina.