Severe Retinopathy of Prematurity (IMAGE) NIH/National Eye Institute Caption Results from an earlier clinical trial confirmed the benefit of using Avastin over laser therapy for treating the most severe cases of ROP, which occur in a region of the retina known as posterior zone 1, as shown. Credit David Wallace, M.D., MPH Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.