A 55 year old man who is hypertensive suddenly lost his vision. The retina is pale and fovea appears as a bright cherry red spot. What is the single most appropriate treatment?

The key is E. Pressure over eyeball. [In central retinal artery occlusion (CRAO) retina becomes pale and fovea becomes cherry red. Hypertension is a major cause of CRAO. Apply direct pressure for 5-15 seconds, then release. Repeat several times. Ocular massage can dislodge the embolus to a point further down the arterial circulation and improve retinal perfusion].