Central Retinal Artery Occlusion (CRAO) is a serious eye condition that occurs when the central retinal artery, which supplies blood to the retina, becomes blocked. This blockage can lead to sudden vision loss in one eye, as the retina is deprived of essential nutrients and oxygen. CRAO is often caused by blood clots or emboli that travel from other parts of the body. Symptoms of CRAO typically include a sudden, painless loss of vision, which may appear as a dark or gray area in the visual field. Prompt medical attention is crucial, as early intervention can sometimes help restore vision or prevent further damage. Risk factors include hypertension, diabetes, and high cholesterol.