Human cones (IMAGE) Johns Hopkins University Caption A section of a human retina. Dotted lines depict an individual green cone in blue and a red cone in pink. Credit Sarah Hadyniak/Johns Hopkins University Usage Restrictions none License Original 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.