<prompt> All of the following may be used to differentiate Central Retinal Venous Occlusion CRVO from Ocular Ischemic Syndrome due to Carotid Artery Stenosis, ExceptDilated retinal veinTortuous retinal veinRetinal artery pressureOphthalmodynamometry  <response>: Ans. a Dilated Retinal veinRef: Yanoff 3e, p. 625Central Retinal vein occlusion and Ocular Ischemic Syndrome due to carotid artery stenosis are both associated with dilated Retinal veins and hence this feature cannot be used to distinguish these conditions. 