Study participants comparison (IMAGE) NIH/National Eye Institute Caption Images of the retina showing enlarged RPE cells (circled) in a male (left) and female (center) study participants with choroideremia compared to a healthy control (right). Credit Credit: Johnny Tam/National Eye Institute Usage Restrictions No restrictions. License Public Domain 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.