With Proliferative Diabetic Retinopathy or PDR many blood vessels close in the retina close preventing adequate blood flow to the retina. The
retina responds to this problem by trying to grow new blood vessels. However, these new abnormal vessels do not
provide proper blood flow. They can also bleed as well as lead to scar tissue, which may cause the retina
to wrinkle or even detach. If similar vessels grow abnormally in the front of the eye, they can block the drainage
channels of the eye and cause high pressure and possibly
glaucoma. Both central
and peripheral vision can be affected by Proliferative Diabetic Retinopathy or PDR.