Tarsier (IMAGE) Dartmouth College Caption In a genetic study of tarsiers' eyes, Dartmouth researchers suggest that primates developed highly acute, three-color vision that permitted them to shift to daytime living. Credit Nathaniel Dominy, Dartmouth College 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.