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quadrantanopia
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.〔(Yale- Cranial Nerve 2, pg. 11 )〕 While quadrantanopia can be caused by lesions in the temporal and parietal lobes, it is most commonly associated with lesions in the occipital lobe.〔Kolb, B & Whishaw, I.Q. Human Neuropsychology, Sixth Edition, p.361; Worth Publishers (2008) ISBN 978-0-7167-9586-5〕 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.〔(Central Visual Pathways )〕
==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.〔William J. Weiner: Neurology for the Non-Neurologist, p.526; Lippincott Williams & Wilkins (July 2010) ISBN 1605472395〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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