Before and After CPAP (image) University of Michigan Health System Share Print E-Mail Caption These images are labeled to show which was taken before the patient had CPAP treatment for sleep apnea, and which was taken after. In the study, independent raters who didn't know which was which were able to tell the difference two-thirds of the time. A detailed analysis of these and other images also showed less redness and forehead puffiness after treatment -- though no improvement in dark circles or puffiness under the eyes. Credit University of Michigan Health System Usage Restrictions None Share Print E-Mail 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.