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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.

Review Date 11/4/2015

Updated by: Franklin W. Lusby, MD, ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.