acuity
[əˈkjuɪti]
n.
尖锐，（疾病的）剧烈，（视力、才智等的）敏锐;
敏度;
例句:
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We work on improving visual acuity.
我们致力于提高视觉的敏锐度。
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On examination, her visual acuity was normal and without apparent proptosis.
眼科学检查两眼大致正常.
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This equates to increased and vigor, better sleep and sharper mental acuity.
也就是说可以起到增强活力, 改善睡眠,提高心智的作用.
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That is, they unambiguously improved visual acuity.
来自SA
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It's a moment of absolute calm and eerie mental acuity.
来自NEWYORKER
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Much depends upon the sensitivity, acuity, and fidelity of the interviewer.
来自NEWYORKER