Microglia Repopulating Retina (IMAGE) NIH/National Eye Institute Caption Images of mouse retina after being treated with a drug that nearly eliminates immune cells called microglia. On day 0 when the drug was stopped, nearly all microglia are gone, except for a few near the optic nerve head (center dark spot). Seven days later, microglia have migrated across the retina, and by day 10 they have increased in number. Credit Wai T. Wong, National Eye Institute Usage Restrictions Please credit Wai T. Wong, National Eye Institute as the source. 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.