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Binasal hemianopsia : ウィキペディア英語版
Binasal hemianopsia

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.
==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

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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