How does avastin (bevacizumab) for eye complication treatment work?

Anti VEGF: Avastin (bevacizumab) is a medication (originally for cancer) that helps prevent new blood vessel growth by inhibiting a certain blood vessel growth factor. Thus it is commonly used in the eye now to prevent neovascularization and swelling associated with abnormal new leaky blood vessels.

Decreased abnormal..: ..Blood vessel growth. Abnormal blood vessels (neovascularization) can leak, leading to swelling and bleeding in the eye, which can cause permanent vision loss. Avastin (bevacizumab) is in a class of drugs known as vascular endothelial growth factor inhibitors (ant-vegf). These drugs specifically decreased abnormal blood vessel growth.