visual acuity

visual acuity   n.  Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20.

Main Entry: visual acuity
Function: noun
: the relative ability of the visual organ to resolve detail that is usually expressed as the reciprocal of the minimum angularseparation in minutes of two lines just resolvable as separate and that forms in the average human eye an angle of one minute —compare MINIMUM SEPARABLE, MINIMUM VISIBLE

visual acuity n.
Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20.