visual acuity(redirected from Twenty-twenty vision)
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Related to Twenty-twenty vision: distance acuity
visual acuity[′vizh·ə·wəl ə′kyü·əd·ē]
The ability to see fine details of an object; specifically, the ability to see an object whose angle subtended at the eye is 1 minute of arc.
A measure of the ability to distinguish fine details; the reciprocal of the angular size of critical detail which is just large enough to be seen.