Myopic Choroidal Neovascularization
What is Myopic Choroidal Neovascularization (mCNV)?
Myopic Choroidal Neovascularization (mCNV) is a common ophthalmic condition that is characterized by the growth of abnormal blood vessels in the choroid, a layer of tissue that lies between the retina and the sclera of the eye. It occurs most often in people with high myopia, or extreme nearsightedness. The abnormal vessels can cause severe vision loss by damaging the delicate retinal tissue.
Causes of Myopic Choroidal Neovascularization (mCNV)
The primary cause of mCNV is the progression of myopia or extreme nearsightedness. Myopia is caused by a combination of genetic and environmental factors, and typically becomes more severe with age. People with high myopia have a greater risk of developing mCNV.
The condition is also associated with other conditions that cause structural changes to the eye, such as retinal degenerations, macular hole formation, and glaucoma.
Symptoms of Myopic Choroidal Neovascularization (mCNV)
The most common symptom associated with mCNV is a loss of central vision. This may be accompanied by:
- Decreased night vision
- Distortion of images
- Visual field defects
- Foveal swelling
- Retinal edema
- Fluctuating vision
- Redness of the eye
- Blurred vision
Diagnosis of Myopic Choroidal Neovascularization (mCNV)
The diagnosis of mCNV typically begins with a comprehensive eye examination which includes a detailed history, eye evaluation and visual field testing. Your eye doctor may also request imaging tests such as optical coherence tomography (OCT) or fundus autofluorescence to help diagnose the condition.
Treatment of Myopic Choroidal Neovascularization (mCNV)
Treatment for mCNV typically involves slowing the progression of the disease. This may include laser photocoagulation, photodynamic therapy (PDT), and anti-vascular endothelial growth factor (VEGF) injections. Surgery may be recommended in severe cases to remove the abnormal blood vessels.
In addition, your doctor may recommend corrective lenses or refractive surgery to reduce the severity of myopia and its progression. It is important to treat any underlying conditions to reduce the risk of further vision loss.