quadrantanopia

四半盲 　

WordNet

1. blindness in one fourth of the visual field

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/05/25 00:10:29」(JST)

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Quadrantanopia
Right homonymous superior quadrantanopia. The areas of the visual field lost in each eye are shown as black areas. This visual field defect is characteristic of damage to Meyer's loop on the left side of the brain.
Classification and external resources
ICD-10	H53.4
ICD-9	368.46

Quadrantanopia, quadrantanopsia, or quadrant anopia refers to an anopia affecting a quarter of the field of vision.

It can be associated with a lesion of an optic radiation. While quadrantanopia can be caused by lesions in the temporal and parietal lobes, it is most commonly associated with lesions in the occipital lobe. If Meyer's loop (temporal pathway) is lesioned, the vision loss is superior (colloquially referred to as "pie in the sky"); if Baum's loop (parietal pathway) is lesioned, the vision loss is inferior.

Homonymous inferior/superior quadrantanopia

Homonymous (denotes a condition which affects the same portion of the visual field of each eye) inferior quadrantanopia and Homonymous superior quadrantanopia are a loss of vision in the same lower or upper quadrant of the visual field in both eyes - either the left lower/upper quadrant - left homonymous inferior/superior quadrantanopia - or the right lower/upper quadrant - right homonymous inferior/superior quadrantanopia.

Homonymous binasal/bitemporal quadrantanopia

NB Homonymous means 'affecting the same side on each eye'. You cannot have a homonymous binasal anopia. This is just 'binasal anopia'. Binasal (either inferior or superior) quadrantanopia affects the inner visual quadrants closer to the nasal cavity in both eyes. Bitemporal (either inferior or superior) quadrantanopia affects the outer visual quadrants in both eyes.

Characteristics of quadrantanopia

An interesting aspect of quadrantanopia is that there exists a distinct and sharp border between the intact and damaged visual fields, due to an anatomical separation of the quadrants of the visual field. For example, information in the left half of visual field is processed in the right occipital lobe and information in the right half of the visual field is processed in the left occipital lobe.

Example of the sharp division between the blind and intact fields (for someone with hemianopsia, rather than quadrantanopia, in this case)

In a quadrantonopia that is partial, there also exists a distinct and sharp border between the intact and damaged field within the quadrant. The sufferer is able to detect light within the damaged visual field.

The prospects of recovering vision in the affected field are bleak. Occasionally, patients will spontaneously recover vision in the affected field within the first three months after the brain injury; however, vision loss remaining after this period of spontaneous recovery is traditionally thought to be permanent, certain companies now claim to be able to induce recovery of vision after this three-month period.

Compensatory behaviors

Individuals with quadrantanopia often modify their behavior to compensate for the disorder, such as tilting of the head to bring the affected visual field into view. Drivers with quadrantanopia, who were rated as safe to drive, drive slower, utilize more shoulder movements and, generally, corner and accelerate less drastically than typical individuals or individuals with quadrantanopia who were rated as unsafe to drive. The amount of compensatory movements and the frequency with which they are employed is believed to be dependent on the cognitive demands of the task; when the task is so difficult that the subject's spatial memory is no longer sufficient to keep track of everything, patients are more likely to employ compensatory behavior of biasing their gaze to the afflicted side. Teaching individuals with quadrantanopia compensatory behaviors could potentially be used to help train patients to re-learn to drive safely.

References

• Quadrantanopsia Visual Fields Teaching Case from MedPix

UpToDate Contents

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• 1. 同名半盲​ homonymous hemianopia
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• 5. 成人​におけるてんかんの​外科的治療​ surgical therapy of epilepsy in adults

English Journal

• An 57-Year-Old Female with Sudden onset of Transient Right Homonymous Hemianopsia.

• Nail TJ1, Araque JM2, Vender J3, Rojiani AM1.
• Brain pathology (Zurich, Switzerland).Brain Pathol.2017 Sep;27(5):691-692. doi: 10.1111/bpa.12539.
• PMID 28805006

• Isolated intracranial fibromuscular dysplasia of the posterior cerebral artery.

• Yeo MJ1, Jeon HY1, Cha MJ1, Jang HY1, Lee SG1, Seon Kim J1, Lee SH1, Lee SS1, Shin DI2.
• Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia.J Clin Neurosci.2017 Sep;43:119-121. doi: 10.1016/j.jocn.2017.04.003. Epub 2017 Apr 18.
• PMID 28431954

• Amygdalohippocampotomy for mesial temporal lobe sclerosis: Epilepsy outcome 5 years after surgery.

• Gonçalves-Ferreira A1, Rainha-Campos A2, Franco A3, Pimentel J4, Bentes C3, Peralta AR3, Morgado C5.
• Acta neurochirurgica.Acta Neurochir (Wien).2017 Aug 29. doi: 10.1007/s00701-017-3305-y. [Epub ahead of print]
• PMID 28849383

Japanese Journal

• 仮名単語が読めて仮名一文字が読めない仮名の失読および失書の1例

• 神経心理学 34(1), 63-73, 2018
• NAID 130006728607

• 右頭頂後頭葉出血により輻湊不全型外斜視を発症した1例

• 神経眼科 32(4), 377-383, 2015
• NAID 130005121307

• 外傷性の左上同名四半盲の合併により診断に苦慮したLeber遺伝性視神経症の1例 (特集 第67回日本臨床眼科学会講演集(5))

• 臨床眼科 68(7), 1025-1030, 2014-07
• NAID 40020132788

Related Links

• Quadrantanopia - Wikipedia, the free encyclopedia

Quadrantanopia, quadrantanopsia, or quadrant anopia refers to an anopia affecting a quarter of the field of vision. It can be associated with a lesion of an optic radiation. If Meyer's loop (temporal pathway) is lesioned, the vision loss is superior ...

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★リンクテーブル★

リンク元	「四分盲」「homonymous hemianopsia」「hemianopsia」「quadrantanopsia」「四半盲」

「四分盲」

　　[★]

英

quadrantic hemianopsia, quadrantanopia、quadrantanopsia, quadrant hemianopia, quadrantic hemianopia

ラ

hemianopsia quadrantica

同

四半盲、四分の一盲、四分の一半盲

関

半盲、同名性半盲、同名半盲、両耳側半盲、四半盲

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en

quadrantic hemianopia : 約 764 件
quadrantic hemianopsia : 約 1,570 件

ja

quadrantic hemianopia : 11 件
quadrantic hemianopsia : 22 件

「homonymous hemianopsia」

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同名半盲、同名性半盲

関

bitemporal hemianopia、bitemporal hemianopsia、hemianopia、hemianopsia、homonymous hemianopia、quadrantanopia、quadrantanopsia

同

同名性半盲

「hemianopsia」

　　[★] 半盲

関

bitemporal hemianopia、bitemporal hemianopsia、hemianopia、hemianopic、homonymous hemianopia、homonymous hemianopsia、quadrantanopia、quadrantanopsia

「quadrantanopsia」

　　[★]

四半盲、四分盲

関

bitemporal hemianopia、bitemporal hemianopsia、hemianopia、hemianopsia、homonymous hemianopia、homonymous hemianopsia、quadrantanopia

「四半盲」

　　[★]

英

quadrantanopia、quadrantanopsia

関

四分盲