- acuity, visual acuity, sharp-sightedness - sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
--1 is a kind of sight, vision, visual sense, visual modality
--1 has particulars: oxyopia - acuteness, acuity, sharpness, keenness - a quick and penetrating intelligence; "he argued with great acuteness"; "I admired the keenness of his mind"
--2 is a kind of intelligence
--2 has particulars: steel trap