World Library  
Flag as Inappropriate
Email this Article

Binasal hemianopsia

Article Id: WHEBN0001170525
Reproduction Date:

Title: Binasal hemianopsia  
Author: World Heritage Encyclopedia
Language: English
Subject: Anopsia, Blindness, Optic papillitis, Positional alcohol nystagmus, Quadrantanopia
Collection: Blindness, Visual Disturbances and Blindness
Publisher: World Heritage Encyclopedia

Binasal hemianopsia

Binasal hemianopsia
Paris as seen with binasal hemianopsia
Classification and external resources
ICD-10 H53.4
ICD-9-CM 368.47
Paris as seen with full visual fields

Binasal hemianopsia (or Binasal hemianopia) is the medical description of a type of partial blindness where vision is missing in the inner half of both the right and left visual field. It is associated with certain lesions of the eye and of the central nervous system, such as congenital hydrocephalus.


  • Etymology 1
  • Causes 2
  • See also 3
  • External links 4


The absence of vision in half of a visual field is described as hemianopsia.

The visual field of each eye can be divided in two vertically, with the outer half being described as temporal, and the inner half being described as nasal.

"Binasal hemianopsia" can be broken down as follows:

  • bi-: involves both left and right visual fields
  • nasal: involves the nasal visual field
  • temporal: involves the temporal visual field
  • lateral: involves the lateral visual field
  • hemi-: involves half of each visual field
  • anopsia: blindness


In binasal hemianopsia, vision is missing in the inner (nasal or medial) half of both the right and left visual fields. Information from the nasal visual field falls on the temporal (lateral) retina. Those lateral retinal nerve fibers do not cross in the optic chiasm. Calcification of the internal carotid arteries can impinge the uncrossed, lateral retinal fibers leading to loss of vision in the nasal field.

Note: Clinical testing of visual fields (by confrontation) can produce false positive result (particularly in inferior nasal quadrants).

See also

External links

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.