Eye Exam (IMAGE) NIH/National Eye Institute Caption An analysis funded by the National Eye Institute, part of the National Institutes of Health, has identified three genes that contribute to the most common type of glaucoma. The study increases the total number of such genes to 15. Credit National Eye Institute Usage Restrictions Must credit as "Courtesy National Eye Institute" 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.