Gear up! Learn to protect your eyes.
Eye Safety
Why Red Eye?
People sometimes have red eyes in photographs, especially those taken with a flash, because of the light that reflects off the blood vessels of the retina.
Important information about this site and your privacy.
See All You Can See is the National Eye Institute's website for kids. Please send general questions and comments to 2020@nei.nih.gov.
Some pages on this site link to PDF files. Download Adobe Reader to view and print PDF files.
Games on this site require Flash. Download Adobe Flash Player to view and play games.
See All You Can See is the National Eye Institute's website for kids. Please send general questions and comments to 2020@nei.nih.gov.
Some pages on this site link to PDF files. Download Adobe Reader to view and print PDF files.
Games on this site require Flash. Download Adobe Flash Player to view and play games.