Disclaimer: This is general health information only and is not a substitute for advice from your GP, optometrist, or ophthalmologist. Sudden changes in vision require urgent medical assessment.
1. What is Branch Retinal Vein Occlusion (BRVO)?
Branch Retinal Vein Occlusion is a condition in which one of the smaller veins draining blood from the retina becomes blocked. The retina is the light-sensitive layer at the back of the eye, and when blood flow is obstructed, it can lead to bleeding, swelling, and reduced vision in the affected area.
2. What causes BRVO?
BRVO usually occurs when a retinal artery crosses over a vein and compresses it, leading to clot formation. Risk factors include high blood pressure, diabetes, high cholesterol, smoking, and cardiovascular disease. Age is also a significant risk factor.
3. What are the symptoms of BRVO?
The most common symptom is sudden, painless blurring or loss of vision in one eye. The degree of vision loss depends on the location and extent of the blockage. Some individuals may notice dark spots, distorted vision, or partial visual field loss.
4. Is BRVO an emergency?
Any sudden change in vision should be treated as urgent. While BRVO itself may not always require immediate hospital admission, prompt assessment by an eye specialist is essential to confirm the diagnosis and prevent complications.
5. How is BRVO diagnosed?
Diagnosis is made through a detailed eye examination, including retinal imaging such as optical coherence tomography to assess swelling, and sometimes fluorescein angiography to evaluate blood flow in the retinal vessels.
6. What complications can occur with BRVO?
The most common complication is macular oedema, which is swelling in the central part of the retina responsible for sharp vision. Other complications may include retinal neovascularisation, where abnormal blood vessels grow and increase the risk of bleeding or glaucoma.
7. How is BRVO treated?
Treatment focuses on managing complications. Injections of anti-vascular endothelial growth factor medications into the eye are commonly used to reduce macular swelling. Steroid injections or laser therapy may also be considered in selected cases.
8. Can vision recover after BRVO?
Visual recovery varies. Some patients experience improvement, especially with early treatment of macular oedema. Others may have persistent visual impairment depending on the severity and duration of retinal damage.
9. How can BRVO be prevented?
Prevention involves controlling underlying risk factors such as high blood pressure, diabetes, and cholesterol. Maintaining a healthy lifestyle, avoiding smoking, and regular health check-ups reduce overall vascular risk.
10. What follow-up is required after a diagnosis of BRVO?
Regular follow-up with an ophthalmologist is essential to monitor for complications and assess treatment response. Ongoing management of systemic cardiovascular risk factors is equally important to reduce the risk of further vascular events in either eye.