The blockage causes structural damage to the veins, which leads to bleeding and fluid leakage into the retina. When a blockage occurs in the central retinal vein, it is known as a central retinal vein occlusion (CRVO). Like the central retinal artery, the central retinal vein has its own system of branches distributed throughout the retinal tissue. The central retinal vein drains the deoxygenated blood from the retinal branches so that the blood can return to the heart where its oxygen levels will be replenished. The Central Retinal VeinĪs the blood moves through the retinal system and fuels the nerve cells, its oxygen levels deplete. Like CRAO, BRAO indicates the increased possibility of having a cerebral stroke and should be treated as a medical emergency. When the affected artery provides the macula with oxygenated blood, BRAO can result in loss of central vision. If a blood clot is located in one of the branches that stem from the central retinal artery, it is known as branch retinal artery occlusion (BRAO). Patients should also keep in mind that CRAO increases a patient’s risk of having a cerebral stroke, so it’s essential to seek medical attention immediately if you experience painless vision loss. The sooner you can get treatment, the more likely you will be able to retain some vision. It is also more common in male patients.ĬRAO can lead to irreversible vision loss if not treated within 24 hours. CRAO most commonly occurs in patients who are between 50 and 70. Central Retinal Artery Occlusion (CRAO)Ĭentral retinal artery occlusion (CRAO) is when a blood clot forms in the central retinal artery and is sometimes referred to as an “eye stroke.” The primary symptom of CRAO is a sudden, painless loss of vision. The central retinal artery runs along the optic nerve and delivers blood through a system of small branches that are distributed throughout the retinal tissue. The retina receives its supply of oxygenated blood from the central retinal artery, which extends from the ophthalmic branch of the internal carotid artery (the artery located in the neck). The main components of the retinal vascular system are the central retinal artery and the central retinal vein. To perform this incredible feat, the retina requires a constant supply of blood and oxygen, which is provided by the retinal vascular system. When light enters the eye through the lens, the retina captures this information and translates it into neural signals for the brain to interpret into an image. Our sense of vision relies primarily on the retina, which is a photosensitive membrane that acts as an intermediary between the eye and brain.
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