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出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/02/24 08:59:45」(JST)
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Binasal hemianopsia |
Paris as seen with binasal hemianopsia
|
Classification and external resources |
ICD-10 |
H53.4 |
ICD-9 |
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.
Contents
- 1 Etymology
- 2 Causes
- 3 See also
- 4 External links
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
- temporal: involves the temporal visual field
- lateral: involves the lateral 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 positive result (particularly in inferior nasal quadrants).
See also
- Bitemporal hemianopsia
- Homonymous hemianopsia
External links
UpToDate Contents
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English Journal
- Impaired reading not due to visual field loss in a patient with a right-hemipsheric lesion.
- Basagni B1, Patané I, Ferrari V, Bruno N.
- Neurocase.Neurocase.2014 Oct;20(5):510-23. doi: 10.1080/13554794.2013.826684. Epub 2013 Aug 28.
- We describe a right-handed patient (M.B.), who developed left hemianopsia and a severe reading impairment after right occipital-parietal hemorrhage. The pattern of his reading deficit was very similar to that of pure alexia (alexia-without-agraphia): extremely slow reading times with frequent graphe
- PMID 23984952
- Hemifield slide from traumatic optic chiasmopathy.
- Pula JH1, Fischer M2, Kattah JC2.
- Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia.J Clin Neurosci.2014 Aug;21(8):1446-7. doi: 10.1016/j.jocn.2014.01.001. Epub 2014 Jan 24.
- A 56-year-old man suffered a high velocity linear acceleration closed head injury, resulting in skull fractures including bone dehiscence at the planum sphenoidale and tuberculum sellae. After regaining consciousness, he reported blurry vision and episodic diplopia. Visual field testing showed a bit
- PMID 24613428
- Visual-evoked potentials in patients with brain circulatory problems.
- Pojda-Wilczek D.
- The International journal of neuroscience.Int J Neurosci.2014 Jul 2. [Epub ahead of print]
- Purpose: The aim of this study was to find out if local brain circulatory problems may influence visual-evoked potentials (VEP). Patients and methods: Thirty-eight patients were divided into the following groups: (I) those with hemianopsia or quadrantanopsia and hemiparesis after brain stroke; (II)
- PMID 24901952
Japanese Journal
- 視野所見より Empty Sella 合併を発見した緑内障の2症例
- 高岸 麻衣,馬場 哲也,廣岡 一行,矢野 いづみ,白神 史雄,竹中 宏和
- 日本眼科紀要 = Folia ophthalmologica Japonica 56(10), 837-841, 2005-10-28
- NAID 10018085070
Related Links
- Hemianopsia; Hemianopsia, Binasal; Hemianopsia, Bitemporal; Hemianopsia, Homonymous; Quadrantanopsia. On-line free medical diagnosis assistant. Ranked list of possible diseases from either several symptoms or a full patient ...
- ... How to Pronounce Homonymous-hemianopsia, Demonstrando e entendendo o ponto cego do seu olho [Teoria da Medicina] Login Edit Sunday, 30 March 2014 Binasal Hemianopsia Videos Video Details Images Wiki Related ...
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- bitemporal hemianopia、bitemporal hemianopsia、hemianopia、hemianopic、homonymous hemianopia、homonymous hemianopsia、quadrantanopia、quadrantanopsia