The retina is the internal layer of the eye that receives and transmits focused images. The retina is normally red due to its rich blood supply.
Update Date 9/16/2011
Updated by: Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.