Choroidal neovascularisation (CNV) describes what happens when abnormal blood vessels grow into a part of the eye called the retina. These blood vessels are fragile and leaky, meaning fluid leaks out into the retina and causes problems with vision.1

CNV often occurs as a result of other eye conditions, such as AMD and extreme short-sightedness (known as ‘pathological myopia’).1,2

To prevent permanent vision loss, treatment for CNV must be started as soon as possible. This means it’s important to tell your doctor immediately if you notice any change in your vision.1

Where can I find more information on CNV?

The following organisations are sources for support, advice and information.

Royal National Institute of Blind People (RNIB)
Support, advice and information for those living with sight loss
Helpline: 0303 123 9999
Mon–Fri 8am–8pm, Sat 9am–5pm

The Macular Society
Advice and support, including free confidential counselling, for people with macular degeneration
Helpline: 0300 303 0111
Mon–Fri 9am–5pm


AMD, age-related macular degeneration.


  1. Dunaief J. What is choroidal neovascularization? Available at: [Accessed June 2020].
  2. Ng DSC, Lai TYY. Anti-VEGF for Non-AMD Causes of Choroidal Neovascularization Proven benefits for a variety of etiologies. June 2017. Available at: [Accessed June 2020].
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OPT20-C039b September 2020.

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