Bitemporal hemianopsia

Bitemporal hemianopsia

DiseaseDisorder infobox
Name = PAGENAME
ICD10 = ICD10|H|53|4|h|53
ICD9 = ICD9|368.47
ICDO =


Caption = Paris as seen with bitemporal hemianopia
OMIM =
MedlinePlus =
eMedicineSubj =
eMedicineTopic =
DiseasesDB =

Bitemporal hemianopsia (or Bitemporal hemianopia) is the medical description of a type of partial blindness where vision is missing in the outer half of both the right and left visual field. It is usually associated with lesions of the optic chiasm, the area where the optic nerves from the right and left eyes cross near the pituitary gland.

Causes

In bitemporal hemianopsia vision is missing in the outer (temporal or lateral) half of both the right and left visual fields. Information from the temporal visual field falls on the nasal (medial) retina. The nasal retina is responsible for carrying the information along the optic nerve, and crosses to the other side at the optic chiasm. When there is compression at optic chiasm the visual impulse from both nasal retina are affected, leading to inability to view the temporal, or peripheral, vision. This phenomenon is known as bitemporal hemianopia. Knowing the neurocircuitry of visual signal flow through the optic tract is very important in understanding bitemporal hemianopia.

Bitemporal hemianopia most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure is the pituitary gland, some common tumors causing compression are Pituitary adenomas, and Craniopharyngiomas.

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".

"Bitemporal hemianopsia" can be broken down as follows:
*"bi-": involves both left and right visual fields
*"temporal": involves the temporal visual field
*"hemi-": involves half of each visual field
*"anopsia": blindness (formed by "a(n) no + opsis vision + ia")

ee also

* Binasal hemianopsia
* Homonymous hemianopsia

External links

* Case report of [http://clinicalcases.blogspot.com/2004/05/bilateral-hemianopsia-due-to-pituitary.html Bilateral Hemianopsia Due to Pituitary Adenoma] . Clinical Cases and Images. at blogspot.com
*


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Hemianopsia — is the loss of half the vision in both eyes. More specifically, it can refer to:* Binasal hemianopsia * Bitemporal hemianopsia * Homonymous hemianopsiaEtymologyHemi an opsia …   Wikipedia

  • hemianopsia bitemporal — Eng. Bitemporal hemianopsia Hemianopsia heterónima en la que se afecta el campo visual temporal de cada ojo. Hemianopsia heterónima bitemporal …   Diccionario de oftalmología

  • hemianopsia bitemporal — Pérdida de la mitad temporal de la visión de cada ojo, habitualmente debido a una lesión en la región quiasmática, como en los tumores hipofisarios. Diccionario ilustrado de Términos Médicos.. Alvaro Galiano. 2010 …   Diccionario médico

  • Hemianopsia — Se conoce como hemianopsia a la falta de visión o ceguera que afecta únicamente a la mitad del campo visual. Puede estar producida por lesiones en el ojo, el nervio óptico o la corteza cerebral. Cada tipo de hemianopsia sugiere diferentes… …   Wikipedia Español

  • hemianopsia heterónima bitemporal — Eng. Bitemporal heteronymous hemianopsia Ver hemianopsia bitemporal …   Diccionario de oftalmología

  • Homonymous hemianopsia — Infobox Disease Name = PAGENAME Caption = Paris as seen with left homonymous hemianopsia DiseasesDB = ICD10 = ICD10|H|53|4|h|53 ICD9 = ICD9|368.46 ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = Homonymous hemianopsia is a… …   Wikipedia

  • Binasal hemianopsia — DiseaseDisorder infobox Name = PAGENAME ICD10 = ICD10|H|53|4|h|53 ICD9 = ICD9|368.47 ICDO = Caption = Paris as seen with binasal hemianopsia OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = DiseasesDB = Binasal hemianopsia (or Binasal… …   Wikipedia

  • Visual field — The term visual field is sometimes used as a synonym to field of view, though they do not designate the same thing. The visual field is the spatial array of visual sensations available to observation in introspectionist psychological experiments …   Wikipedia

  • Campo visual — Saltar a navegación, búsqueda El campo visual es la porción del espacio que el ojo es capaz de ver. El examen del campo visual permite determinar sus límites para cada ojo. Diferentes enfermedades oftalmológicas o cerebrales pueden ocasionar… …   Wikipedia Español

  • Anterior communicating artery — Infobox Artery Name = Anterior communicating artery Latin = arteria communicans anterior GraySubject = 146 GrayPage = 572 Caption = The cerebral arterial circle and arteries of the brain. The anterior communicating arteries (top of figure)… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”