Optical Imaging (IMAGE) NIH/National Eye Institute Caption Signal from optical imaging (top) matches the signal from an electrode array (bottom). Credit Courtesy of Daniel Palanker, Ph.D., Stanford University. Usage Restrictions May be used with attribution. 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.