• What Are Choroidal Neovascular Membranes?

    Written by: Kierstan Boyd
    Oct. 14, 2015

    In the eye, a healthy, intact retina is key to clear vision. The retina is the light-sensitive tissue lining the back of the eye. It converts light rays into electrical impulses that travel through the optic nerve to our brain, where they are interpreted as the images we see.

    Choroidal neovascular membranes (CNVM) are new blood vessels that grow beneath the retina and disrupt vision. These blood vessels grow in an area called the choroid, the area between the retina and the sclera (the white part of your eye). The choroid supplies oxygen and nutrients to the eye. CNVM occur when new blood vessels start to grow in the choroid and break through the barrier between the choroid and the retina. When CNVM leak in the retina, they cause vision loss.

    CNVM are associated with many serious eye diseases, most commonly wet age-related macular degeneration. In addition, CNVM are found in patients with histoplasmosis, eye trauma and myopic macular degeneration, an eye disease in patients who are extremely nearsighted.