A choroidal neovascular membrane (CNVM) is a complication related to many different underlying retinal conditions. CNVM is most often associated with agre related macular degeneration (AMD). With CNVM, the blood vessels below the choroid begin to grow up through defects in other retinal layers much like grass will grow through cracks in a sidewalk. These new blood vessels are fragile and often leak causing fluid to settle in the different retinal layers. The fluid causes the retinal tissue to function poorly and creates deteriorated vision. The severity of symptoms depends on how big the CNVM areas is and its proximity to the central macula (the macula is the area of the eye responsible for detailed central vision).

Patients with CNVM or at risk for the disease should perform an Amsler grid test at home each day. The test is available by clicking here.

Signs and Symptoms
blurred vision, often distorted vision
blind spot located in the center of vision

Diagnosis
Patients should first test their vision using an Amsler Grid. The results of this test will help the doctor learn the location and severity of the problem. The doctor will then conduct a dye study called a fluorescein angiogram. This study is used to see the circulation of the retina and expose any areas of leaking blood vessels.

Treatment
Treatment for CNVM varies and is dependent on many factors including size, proximity to the macular, and time passed since initial symptoms. Typically, laser photocoagulation is performed. This laser treatment is the simplest form of treatment and is used to seal leaking blood vessels. Because laser photocoagulation creates a scar, it is reserved for leaks outside of the patients central vision or macula. Other forms of less damaging laser are used for CNVM in the middle of the macula.

The Retina Eye Center provides this information for educational and communication purposes only and it should not be construed as medical advice. Information published on this website is not intended to replace, supplant, or augment a consultation with an retina professional regarding the viewer's own medical care. The Retina Eye Center disclaims any and all liability for injury or other damages that could result from use of the information obtained from this site.