…When an object is twice as large or half as far away, the visual angle is 2 minutes and visual acuity is 0.5. Visual acuity is best in the central vision at the fovea of the macula, and visual acuity drops rapidly as you move away from the center. Peripheral vision is an important part of the visual field, physiologically speaking. *Some of the terminology that mentions "central vision" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…そこで,この2倍の大きさ,あるいは半分の距離で見分けられるとき,視角は2分となり視力は〈0.5〉となる。視力は黄斑部中心窩(か)における中心視力central visionが最もよく,中心からはずれると視力は急激に低下する。中心外(周辺)視力は,生理的には視野visual fieldに相当する重要な部分である。… ※「central vision」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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