Roadmap for Inherited Eye Diseases (IMAGE) University of Pennsylvania School of Medicine Caption Photoreceptor sensory cilia (right) are the light sensitive parts of the rods and cones in the eye's retina (middle and left). Credit Qin Liu, MD, PhD and Eric A. Pierce, MD, PhD, University of Pennsylvania School of Medicine, National Eye Institute, National Institutes of Health 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.