acuity

noun

a quick and penetrating intelligence
素早く見抜く知性
- he argued with great acuteness
  彼はすばらしい鋭さで論争した
- I admired the keenness of his mind
  私は彼の心の熱心さを賞賛した
sharpness of vision
視力

the visual ability to resolve fine detail (usually measured by a Snellen chart)
細部を決定する視覚能力（通常、スネレン視力表で測定する）

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