Retinal Layers (IMAGE) Duke University Caption A comparison of the thickness of retinal layers between wild, healthy mice (top), and mice that have been genetically bred to show symptoms of Alzheimer's disease (bottom). The top layer of the retina from the mice with Alzheimer's disease is clearly thinner. Credit Ge Song, Duke University 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.