Nonproliferative (Background) Retinopathy – causes the blood vessels in the retina to change diameter. Some blood vessels shrink while others swell. This random change in diameter affects blood flow to the retina. This variance of blood flow can also affect other areas of the eye – some areas do not get enough blood while other areas hemorrhage. Nonproliferative retinopathy usually does not negatively affect vision and usually does not worsen over time. But left unmonitored, nonproliferative retinopathy can damage the eye. Nonproliferative retinopathy can be a predecessor of proliferative retinopathy, which is a far more serious form of diabetic retinopathy.