Definition of "retina" []

• A delicate, multilayered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The clarity of the images produced on the retina is a factor which determines the power of vision."
• "The retina is a thin layer of nerve tissue that coats the back of the eye and enables the eye to see."
• ""Inverted retina" is part of visual system that works very well in humans and birds, so on what basis does Johnson call this "bad design"."