関: bitemporal hemianopia、bitemporal hemianopsia、hemianopia、hemianopsia、homonymous hemianopia、homonymous hemianopsia、quadrantanopia

WordNet

blindness in one half of the visual field of one or both eyes (同)hemianopsia
blindness in one fourth of the visual field

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/06/18 22:25:36」(JST)

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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.^[1] While quadrantanopia can be caused by lesions in the temporal and parietal lobes, it is most commonly associated with lesions in the occipital lobe.^[2] If Meyer's loop (temporal pathway) is lesioned, the vision loss is superior (colloquially referred to as "pie in the sky"); if [[optic radiation | (parietal pathway) is lesioned, the vision loss is inferior.^[3]

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.^[4]

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.^[2]

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.^[5]

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.^[6] 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.^[7] Teaching individuals with quadrantanopia compensatory behaviors could potentially be used to help train patients to re-learn to drive safely.

References

^ Yale- Cranial Nerve 2, pg. 11
^ ^a ^b Kolb, B & Whishaw, I.Q. Human Neuropsychology, Sixth Edition, p.361; Worth Publishers (2008) ISBN 978-0-7167-9586-5
^ Central Visual Pathways
^ William J. Weiner: Neurology for the Non-Neurologist, p.526; Lippincott Williams & Wilkins (July 2010) ISBN 1605472395
^ Rehabilitation for Homonymous Hemianopia and Quadrantanopia
^ Visual Fields in Brain Injury - Hemianopsia.net Everything you need to know about Hemianopsia
^ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3101691/

Quadrantanopsia Visual Fields Teaching Case from MedPix

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Qi S1, Fan J, Zhang XA, Zhang H, Qiu B, Fang L.
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Distal embolic brain infarction due to recanalization of asymptomatic vertebral artery occlusion resulting from cervical spine injury: a case report.

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Japanese Journal

急性鼻副鼻腔炎に合併した硬膜下膿瘍例

耳鼻咽喉科臨床 109(7), 487-492, 2016
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頸動脈ステント留置術後に偶然発見された感染性脳動脈瘤の1 例

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リンク元	「四分盲」「homonymous hemianopsia」「hemianopsia」「四半盲」
拡張検索	「homonymous lower quadrantanopsia」「homonymous upper quadrantanopsia」

「四分盲」

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

　　[★]

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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「homonymous hemianopsia」

　　[★]

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

「四半盲」

　　[★]

英: quadrantanopia、quadrantanopsia
関: 四分盲

「homonymous lower quadrantanopsia」

　　[★]

同: 同名性下四分盲

「homonymous upper quadrantanopsia」

　　[★]

同: 同名性上四分盲

[1] Yale- Cranial Nerve 2, pg. 11

[autogenerated1-2] Kolb, B & Whishaw, I.Q. Human Neuropsychology, Sixth Edition, p.361; Worth Publishers (2008) ISBN 978-0-7167-9586-5

[3] Central Visual Pathways

[4] William J. Weiner: Neurology for the Non-Neurologist, p.526; Lippincott Williams & Wilkins (July 2010) ISBN 1605472395

[5] Rehabilitation for Homonymous Hemianopia and Quadrantanopia

[6] Visual Fields in Brain Injury - Hemianopsia.net Everything you need to know about Hemianopsia

[7] ttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC3101691/

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quadrantanopsia