Acuity

n. acuteness, keenness (usually of the senses)

Acuity may refer to:Visual acuity, the behavioral ability to resolve fine image detailsAcuity Insurance, an insurance company with headquarters in Sheboygan, Wisconsin
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Noun
1. sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
(synonym) visual acuity, sharp-sightedness
(hypernym) sight, vision, visual sense, visual modality
(hyponym) oxyopia
2. a quick and penetrating intelligence; "he argued with great acuteness"; "I admired the keenness of his mind"
(synonym) acuteness, sharpness, keenness
(hypernym) intelligence
(hyponym) steel trap

(n.)
Sharpness or acuteness, as of a needle, wit, etc.
  

noun
sharpness
visual acuity = being able to see objects clearly