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 2/7/2013 by Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, California. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.
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