What is neovascularization of the disc or NVD?

What is neovascularization of the disc or NVD?

When tiny abnormal blood vessels grow over the optic disc it is called neovascularization of the disc or NVD. This is seen when a major part of the retina is ischemic and does not receive good blood supply. This is seen in proliferative diabetic retinopathy, proliferative retinopathy due to branch retinal vein occlusion or central retinal vein occlusion or Eale’s retinopathy. This is a dangerous sign and need immediate treatment.