All of the following may be used to differentiate Central Retinal Venous Occlusion (CRVO) from Oscular Ischemic Syndrome due to Carotid Artery Stenosis ,Except

• A. Retinal Artery Pressure
• B. Opthalmodynamometry
• C. Dilated Retinal Vein
• D. Tortuous Retinal Vein