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Retinal Vein Occlusion (RVO)

Retinal vein occlusion (RVO) is a common retinal vascular condition that occurs when one of the veins responsible for draining blood from the retina becomes blocked. This blockage can lead to retinal hemorrhages, swelling, reduced blood flow, and vision loss.

RVO is sometimes described as a "stroke of the retina," although it differs from a brain stroke. It is the second most common retinal vascular disease after diabetic retinopathy and can affect people of all ages, but it is more common in older adults.

Fortunately, advances in retinal imaging and treatment have dramatically improved outcomes for many patients with retinal vein occlusion.

What Is the Retina?

The retina is the thin, light-sensitive tissue lining the back of the eye. It converts light into electrical signals that travel through the optic nerve to the brain, allowing us to see.

Healthy retinal arteries deliver oxygen-rich blood to the retina, while retinal veins carry blood away from the eye. When a retinal vein becomes blocked, blood and fluid can back up into the retina, causing damage and vision problems.

Types of Retinal Vein Occlusion

Branch Retinal Vein Occlusion (BRVO)

BRVO occurs when one of the smaller branches of the retinal vein becomes blocked.

This is the more common form of RVO.

Symptoms may include:

  • Blurred vision
  • Distorted vision
  • Partial loss of the visual field
  • Central vision loss if the macula is involved

Central Retinal Vein Occlusion (CRVO)

CRVO occurs when the main retinal vein becomes blocked.

It often causes:

  • More severe vision loss
  • Widespread retinal hemorrhages
  • Significant retinal swelling
  • Increased risk of complications

What Causes Retinal Vein Occlusion?

The exact cause of RVO is not always clear, but it often develops when changes in blood flow and blood vessel health contribute to vein blockage.

Risk factors include:

  • High blood pressure
  • Diabetes
  • High cholesterol
  • Glaucoma
  • Smoking
  • Cardiovascular disease
  • Increasing age
  • Obstructive sleep apnea

In younger patients, additional evaluation may be recommended to investigate clotting disorders or inflammatory conditions.

Symptoms of Retinal Vein Occlusion

Symptoms usually occur suddenly, although some patients notice gradual changes.

Common symptoms include:

  • Blurred vision
  • Sudden vision loss
  • Distorted or wavy vision
  • Difficulty reading
  • Blind spots
  • Reduced contrast sensitivity

The severity of symptoms depends on:

  • Which vein is involved
  • Whether the macula is affected
  • The amount of retinal ischemia (poor blood flow)

How Is Retinal Vein Occlusion Diagnosed?

A retina specialist diagnoses RVO through a comprehensive examination and retinal imaging.

Dilated Retinal Examination

Characteristic findings may include:

  • Retinal hemorrhages
  • Dilated and tortuous veins
  • Cotton wool spots
  • Macular edema
  • Areas of retinal ischemia

Optical Coherence Tomography (OCT)

OCT is one of the most important tests in RVO.

It helps identify:

  • Macular edema
  • Retinal thickening
  • Response to treatment
  • Changes over time

Fluorescein Angiography

This imaging study evaluates blood flow and can identify:

  • Areas of poor circulation
  • Leakage from retinal vessels
  • Abnormal blood vessel growth

Monitoring Intraocular Pressure

Eye pressure measurements are important because some patients may develop glaucoma-related complications.

Complications of Retinal Vein Occlusion

Macular Edema

Swelling of the central retina is the most common cause of vision loss in RVO.

Retinal Ischemia

Reduced blood flow can damage retinal tissue.

Neovascularization

Abnormal new blood vessels may develop due to poor circulation.

These vessels can lead to:

  • Vitreous hemorrhage
  • Tractional retinal detachment
  • Neovascular glaucoma

Treatment for Retinal Vein Occlusion

Treatment focuses on preserving vision, reducing swelling, and preventing complications.

Anti-VEGF Injections

Anti-VEGF medications are often the first-line treatment for macular edema caused by RVO.

These injections help:

  • Reduce retinal swelling
  • Improve vision
  • Stabilize the retina

Common medications include:

  • Aflibercept
  • Ranibizumab
  • Bevacizumab
  • Faricimab

Most patients require repeated injections over time. Many may require long-term or even life-long treatment.

Steroid Therapy

Steroids may be used in selected cases to reduce inflammation and macular edema.

Options include:

  • Intravitreal steroid injections
  • Steroid implants

Laser Treatment

Laser photocoagulation may be recommended for:

  • Neovascularization
  • Selected cases of ischemic disease

Managing Systemic Risk Factors

Patients should work with their primary care physician to address:

  • Blood pressure control
  • Blood sugar management
  • Cholesterol treatment
  • Smoking cessation
  • Cardiovascular health

What Is the Prognosis?

The outlook varies depending on:

  • Whether BRVO or CRVO is present
  • The severity of macular edema
  • The extent of retinal ischemia
  • Response to treatment

Many patients maintain or improve vision with modern therapies.

However, some cases require long-term monitoring and repeated treatment.

Early diagnosis and adherence to follow-up appointments are important for optimizing outcomes.

Living With Retinal Vein Occlusion

Patients with RVO should:

  • Attend all scheduled retina appointments.
  • Monitor vision changes.
  • Control blood pressure, diabetes, and cholesterol.
  • Avoid smoking.
  • Report worsening vision promptly.
  • Maintain regular communication with both their retina specialist and primary care physician.

Managing overall cardiovascular health is an important part of treatment.

Frequently Asked Questions

Is retinal vein occlusion a stroke?

RVO is sometimes called a "stroke of the retina" because it involves blocked blood flow, but it is different from a stroke affecting the brain.

Can vision improve after retinal vein occlusion?

Yes. Many patients experience stabilization or improvement in vision with treatment, particularly when macular edema is addressed promptly.

Will I need ongoing injections?

Many patients require a series of anti-VEGF injections over months or years, although treatment frequency varies depending on disease activity.

More Information

For additional patient information, visit the American Society of Retina Specialists Retinal Vein Occlusion Page.

References

  • American Society of Retina Specialists (ASRS) – Retinal Vein Occlusion
  • American Academy of Ophthalmology – Retinal Vein Occlusions
  • National Eye Institute – Retinal Vein Occlusion
  • EyeWiki – Retinal Vein Occlusion