Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Homonymous Hemianopsia

  • Kerry DonnellyEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_739

Synonyms

Homonymous hemianopia

Definition

A visual defect characterized by blindness in one-half of the visual field that is comparable in both eyes. For example, with a left homonymous hemianopsia, when looking straight ahead the patient would not be able to see anything to the left of midline regardless of which eye was being tested. Such a visual field defect is the result of an interruption of the visual pathways anywhere after the partial crossing of the visual fibers in the optic chiasm to the occipital cortex. This then could involve the optic tract, the lateral geniculate nucleus, the optic radiations, or the primary visual cortex. Two potential exceptions to this rule might be noted. One is that if the lesion producing the hemianopsia is in the visual cortex, the patient might retain a small amount of foveal vision in the very central part of the left visual field, a phenomenon known as macular sparing(probably due to overlapping vascular distributions for this critical...
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References and Readings

  1. Mendoza, J. E. & Foundas, A. L. (2008). Clinical Neuroanatomy: A Neurobehavioral Approach. New York: Springer.Google Scholar
  2. Wilson-Pauwek, L., Akesson, E. J., Stewart, P. A., & Spacey, S. D. (2002). Cranial nerves in health and disease. Hamilton: B.C. Decker.Google Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.VA WNY Healthcare SystemUniversity of Buffalo (SUNY) Behavioral Health Careline (116B)BuffaloUSA