Understanding Choroidal Neovascularization
What Is Choroidal Neovascularization?
CNV happens when new, abnormal blood vessels sprout from the choroid, the layer that supplies oxygen and nutrients to the retina. These vessels can damage the light-sensitive cells that allow you to see clearly.
In a healthy eye, vessel growth is tightly controlled. When this balance is lost, abnormal vessels form and may leak, leading to blurred or distorted vision.
As of 2025, about 58,000 adults in the country are affected by myopic CNV, reflecting a prevalence of roughly 0.017 percent.
Leaking fluid or blood disrupts the retinal layers, damaging rods and cones. Over time, central vision may blur, colors can fade, and straight lines may look wavy.
When Should You Seek Help?
CNV can develop silently, making early warning signs easy to overlook. Recognizing symptoms and acting fast helps protect sight.
If you notice any of the changes below, consult an eye doctor promptly.
- Blurry or distorted central vision
- Straight lines appearing wavy
- Dark or gray patches in central vision
- Reduced contrast or trouble recognizing faces
- Visual changes that worsen quickly
Swift evaluation allows treatments to begin before permanent damage occurs, giving you the best chance to preserve vision.
Diagnostic Tools for CNV
Modern imaging tests help eye care providers locate abnormal vessels and plan effective treatment.
A special dye is injected into a vein in your arm. As the dye reaches the eye, photos reveal areas where vessels leak, showing the size and location of CNV.
OCT uses light waves, not injections, to create detailed cross-section images of the retina. These scans show fluid buildup, membrane changes, and damage over time.
Treatment Options for CNV
The best treatment depends on the membrane’s type, size, and location, as well as overall eye health.
Drugs that block vascular endothelial growth factor are injected into the eye. They slow new vessel growth and reduce leakage. Several injections over months are common.
A light-activated drug is given by vein and later activated by a low-energy laser in the eye. This damages leaking vessels while sparing nearby tissue.
A high-energy laser seals abnormal vessels with tiny burns. Although used less often today, it can help when vessels are well defined and outside the center of vision.
Causes and Risk Factors
Multiple conditions can disturb the barrier between the retina and choroid, triggering abnormal vessel growth.
Progression from dry to wet AMD is a leading cause. Drusen buildup and thinning retina raise VEGF levels, encouraging CNV.
Injury or prior eye surgery can break Bruch’s membrane, giving vessels a pathway to the retina.
Chronic inflammatory diseases and high myopia can weaken retinal layers, increasing CNV risk.
Breaks in the elastic layer under the retina, tumors, or certain infections can also lead to abnormal vessel growth.
Preventative Measures and Lifestyle Considerations
Healthy habits support overall eye health and may lower the chance of CNV, especially in people at higher risk.
Quitting smoking slows the progression of macular degeneration and reduces CNV risk.
Eat fruits, vegetables, and foods rich in vitamins C and E and omega-3 fatty acids to nourish the retina.
Physical activity improves circulation, which benefits eye tissue.
Maintaining a healthy weight supports vascular health throughout the body, including the eyes.
Wearing sunglasses that block ultraviolet rays shields the eyes from sun-induced damage.
Partner With Our Retina Specialists
Early detection and tailored treatment give you the best chance to preserve clear vision. Our eye care team stands ready to guide you through diagnosis, management, and long-term monitoring so you can feel confident about your eye health journey.
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