A sudden change in vision can be concerning, particularly when it affects only one eye. Retinal vessel occlusion occurs when a blood vessel in the retina becomes blocked, disrupting normal blood flow and potentially affecting vision.
The condition can involve a retinal vein or artery, and its effects vary depending on the location and severity of the blockage.
When blood flow is disrupted, the retina may swell, bleed, or become deprived of oxygen, potentially affecting central or peripheral vision.
What Is Retinal Vessel Occlusion?
Retinal vessel occlusion is a blockage in one of the blood vessels that supplies or drains the retina. The retina needs a continuous blood supply to function properly. When a vessel becomes blocked, it can lead to bleeding, swelling, or reduced blood flow within the retinal tissue. There are two main forms.
Retinal Vein Occlusion
A retinal vein carries blood away from the retina. When it becomes blocked, blood can back up within the retinal circulation, causing swelling and leakage.
The two main types are:
- Branch retinal vein occlusion (BRVO): A blockage affects a smaller branch of the retinal vein.
- Central retinal vein occlusion (CRVO): The blockage affects the main retinal vein.
Retinal Artery Occlusion
A retinal artery supplies oxygen-rich blood to the retina. A blockage can significantly reduce blood flow and may cause sudden vision loss.
Because retinal artery occlusion can be an emergency, sudden vision loss requires immediate medical attention.
Retinal Occlusion Symptoms
The retinal occlusion symptoms you experience depend on the vessel involved and the area of the retina affected.
Possible symptoms include:
- Blurred or reduced vision in one eye
- Sudden changes in vision
- Distorted vision
- A dark or missing area in your visual field
- Difficulty seeing fine details
- Sudden vision loss
Retinal vein occlusion may not cause pain, and some people may initially notice only a mild change in vision. However, a sudden or unexplained change should always be evaluated promptly.
What Causes Retinal Vein Occlusion?
There isn't always one specific cause. Retinal vein occlusion causes are often associated with conditions that affect blood vessels and circulation.
Retinal Vein Occlusion Risk Factors
Factors that may increase the risk include:
- High blood pressure
- Diabetes
- High cholesterol
- Glaucoma
- Cardiovascular disease
- Smoking
- Increasing age
These factors do not mean that someone will necessarily develop an occlusion. Your overall health, eye health, and vascular history all contribute to your individual risk.
How Can Retinal Vein Occlusion Affect Vision?
Retinal vein occlusion vision changes often occur when the blockage causes fluid to accumulate in the retina.
One possible complication is macular edema, or swelling in the macula. Because the macula is responsible for detailed central vision, swelling in this area can make everyday activities such as reading or recognizing faces more difficult.
Vision changes can include:
- Blurry central vision
- Distortion
- Reduced visual sharpness
- Difficulty reading
- Difficulty recognizing faces
The impact varies from person to person. Some patients experience relatively mild changes, while others may develop more significant vision loss.
How Is Retinal Vessel Occlusion Diagnosed?
A detailed retinal examination helps determine whether an occlusion is present and whether complications have developed.
Dilated Eye Examination
Dilating the pupils allows our retina specialist to examine the retina and look for signs of bleeding, swelling, vessel abnormalities, or reduced blood flow.
OCT Imaging
Optical coherence tomography, or OCT, produces detailed cross-sectional images of the retina. It can show swelling or fluid affecting the macula.
Fluorescein Angiography
During this test, a dye is injected into a vein in the arm. As the dye travels through the retinal circulation, images can reveal areas of leakage or abnormal blood flow.
The results of these tests help determine the type and severity of the occlusion and guide treatment decisions.
Retinal Occlusion Treatment Options
The appropriate retinal occlusion treatment depends on the type of blockage and whether complications such as macular edema or abnormal blood vessel growth are present.
Anti-VEGF Injections
Anti-VEGF medications may be recommended when retinal vein occlusion causes swelling in the macula. These medications can help reduce fluid leakage and retinal swelling.
Some patients require multiple treatments over time, with follow-up visits to monitor their response.
Steroid Treatment
In selected cases, corticosteroid treatment may be considered to manage retinal swelling. Our retina specialist will determine whether this approach is appropriate based on your individual findings.
Laser Treatment
In selected cases, laser treatment may be used when retinal vein occlusion leads to retinal ischemia, abnormal blood vessel growth, or other complications.
Monitoring
Not every patient requires immediate treatment. Some cases may be monitored closely with regular examinations and retinal imaging. If the condition changes, treatment can be adjusted accordingly.
When Should You See a Retina Specialist?
Sudden vision changes should never be ignored.
Seek prompt medical evaluation if you experience:
- Sudden loss of vision
- New or rapidly worsening blurred vision
- A significant change in vision in one eye
- A dark or missing area in your field of vision
Early evaluation allows a retina specialist to determine the cause and identify any complications that may require treatment.
Why Choose Dr. Paul Hahn?
Dr. Paul Hahn, MD, PhD, FASRS, is a board-certified retina specialist with extensive experience treating retinal diseases. He is fellowship-trained in vitreoretinal surgery and has more than nine years of surgical experience in retina care.
Dr. Hahn has also led more than 30 clinical trials in retinal disease treatment. At phRETINA in Nanuet, NY, he combines advanced retinal diagnostics with evidence-based treatment and individualized patient care.
His approach focuses on explaining your condition clearly, answering your questions, and developing a treatment plan based on your specific retinal findings.
Conclusion
Retinal vessel occlusion can affect vision when a retinal blood vessel becomes blocked. Symptoms may range from mild blurring to significant or sudden vision loss, depending on the type and severity of the occlusion.
Because some retinal vascular problems require prompt attention, unexplained changes in vision should not be ignored. A comprehensive retinal evaluation can identify the cause and help determine the appropriate next step.
Frequently Asked Questions
-
What is retinal vessel occlusion?
Retinal vessel occlusion occurs when a blood vessel in the retina becomes blocked. It may affect a retinal vein or artery and can interfere with normal blood flow. -
What are the symptoms of retinal occlusion?
Retinal occlusion symptoms may include blurred or reduced vision, distortion, dark areas in the visual field, difficulty seeing details, or sudden vision loss. -
What are the main risk factors for retinal vein occlusion?
Common retinal vein occlusion risk factors include high blood pressure, diabetes, high cholesterol, glaucoma, cardiovascular disease, smoking, and increasing age. -
Can retinal vein occlusion cause permanent vision problems?
It can. The effect on retinal vein occlusion vision depends on factors such as the location of the blockage, the extent of retinal damage, and whether complications such as macular edema develop. -
How is retinal occlusion treated?
Retinal occlusion treatment may include anti-VEGF injections, steroid treatment, laser therapy, or careful monitoring, depending on the patient's condition.