...When there is a central scotoma, it is often accompanied by a decrease in vision, and can be broadly divided into two categories: those caused mainly by optic nerve diseases such as optic neuritis, and those caused by macular chorioretinal diseases such as central retinitis. In addition, a loss of the right or left half of the visual field of both eyes, with a vertical line passing through the point of gaze as the boundary, is called hemianopsia. A loss of the same side of both eyes is called homonymous hemianopsia (there are right homonymous hemianopsia and left homonymous hemianopsia), and a loss of the opposite side of both eyes is called heteroonymous hemianopsia (there are bitemporal hemianopsia and binasal hemianopsia). ... *Some of the terminology that mentions "hemianopsia" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…中心暗点がある場合,視力の低下を伴っていることが多く,主として視神経炎のような視神経疾患によって起こるものと,中心性網膜炎のような黄斑部の網脈絡膜疾患によって起こるもの,の二つに大別される。 また,注視点を通る垂直線を境界として,両眼の視野の右半部あるいは左半部が欠損するものを半盲hemianopsiaという。両眼の同側が欠損するものを同名半盲homonymous hemianopsia(右同名半盲と左同名半盲がある)といい,両眼の反対側が欠損するものを異名半盲heteronymous hemianopsia(両耳側半盲と両鼻側半盲がある)という。… ※「hemianopsia」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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