Fig.1 Light and dark adaptation (IMAGE) Osaka University Caption In low light, dark adaptation is achieved by increasing photosensitivity. Under bright conditions, light adaptation is achieved by decreasing photosensitivity. Credit Osaka 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.