20/20

 Dictionary entry overview: What does 20/20 mean? 

• 20/20 (noun)
  The noun 20/20 has 1 sense:

1. normal visual acuity, as measured by the ability to read charts at a distance of 20 feet

  Familiarity information: 20/20 used as a noun is very rare.

 Dictionary entry details 

• 20/20 (noun)

Sense 1

Meaning:

Normal visual acuity, as measured by the ability to read charts at a distance of 20 feet

Classified under:

Nouns denoting cognitive processes and contents

Synonyms:

20/20; twenty-twenty

Hypernyms ("20/20" is a kind of...):

acuity; sharp-sightedness; visual acuity (sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart))

 Context examples 

Many patients who have LASIK end up with 20/20 vision.

(Laser Eye Surgery, NIH)