Binasal hemianopsia

Revision as of 17:59, 20 May 2009 by Kogando (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

Template:DiseaseDisorder infobox

WikiDoc Resources for Binasal hemianopsia

Articles

Most recent articles on Binasal hemianopsia

Most cited articles on Binasal hemianopsia

Review articles on Binasal hemianopsia

Articles on Binasal hemianopsia in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Binasal hemianopsia

Images of Binasal hemianopsia

Photos of Binasal hemianopsia

Podcasts & MP3s on Binasal hemianopsia

Videos on Binasal hemianopsia

Evidence Based Medicine

Cochrane Collaboration on Binasal hemianopsia

Bandolier on Binasal hemianopsia

TRIP on Binasal hemianopsia

Clinical Trials

Ongoing Trials on Binasal hemianopsia at Clinical Trials.gov

Trial results on Binasal hemianopsia

Clinical Trials on Binasal hemianopsia at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Binasal hemianopsia

NICE Guidance on Binasal hemianopsia

NHS PRODIGY Guidance

FDA on Binasal hemianopsia

CDC on Binasal hemianopsia

Books

Books on Binasal hemianopsia

News

Binasal hemianopsia in the news

Be alerted to news on Binasal hemianopsia

News trends on Binasal hemianopsia

Commentary

Blogs on Binasal hemianopsia

Definitions

Definitions of Binasal hemianopsia

Patient Resources / Community

Patient resources on Binasal hemianopsia

Discussion groups on Binasal hemianopsia

Patient Handouts on Binasal hemianopsia

Directions to Hospitals Treating Binasal hemianopsia

Risk calculators and risk factors for Binasal hemianopsia

Healthcare Provider Resources

Symptoms of Binasal hemianopsia

Causes & Risk Factors for Binasal hemianopsia

Diagnostic studies for Binasal hemianopsia

Treatment of Binasal hemianopsia

Continuing Medical Education (CME)

CME Programs on Binasal hemianopsia

International

Binasal hemianopsia en Espanol

Binasal hemianopsia en Francais

Business

Binasal hemianopsia in the Marketplace

Patents on Binasal hemianopsia

Experimental / Informatics

List of terms related to Binasal hemianopsia

Please Take Over This Page and Apply to be Editor-In-Chief for this topic: There can be one or more than one Editor-In-Chief. You may also apply to be an Associate Editor-In-Chief of one of the subtopics below. Please mail us [1] to indicate your interest in serving either as an Editor-In-Chief of the entire topic or as an Associate Editor-In-Chief for a subtopic. Please be sure to attach your CV and or biographical sketch.


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

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
  • hemi-: involves half of each visual field
  • anopsia: blindness

Causes

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 +ive result (particularly in inferior nasal quadrants).

See also

External links


Template:SIB

Template:WH Template:WS