visual acuity

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visual acuity

[′vizh·ə·wəl ə′kyü·əd·ē]
(physiology)
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

visual acuity

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.