Astyanax mexicanus (image) University of Maryland Share Print E-Mail Caption The fish Astyanax mexicanus exists in two distinct forms: A surface-dwelling form with eyes (top) and a blind, cave-dwelling form without eyes (bottom). A new study reveals that the cave-dwelling form loses its eyes due to the silencing of more than two dozen genes -- many of which are shared by humans and have been implicated in human eye disorders. Credit NIH 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.