visual acuity

Từ điển WordNet v3.1 - WordNet Dictionary

noun

sharpness of vision;
the visual ability to resolve fine detail (usually measured by a Snellen chart)
• Syn:
acuity, sharp-sightedness
• Derivationally related forms:
sharp-sighted (for: sharp-sightedness)
• Hypernyms:
sight, vision, visual sense, visual modality
• Hyponyms:
twenty-twenty, 20/20, oxyopia