La visión se considera normal cuando la luz está enfocada directamente sobre la retina, en lugar de estarlo enfrente o detrás de ella.
Last reviewed 9/18/2012 by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc. Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, California.
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