visual acuity

noun Ophthalmology.
acuteness of the vision as determined by a comparison with the normal ability to define certain letters at a given distance, usually 20 feet (6 meters). Abbreviation: V.

Origin:
1885–90

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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
There is evidence that anthocyanins also have anti-inflammatory activity,
  promote visual acuity, and hinder obesity and diabetes.
Humans' sense of hearing and smell are greatly atrophied in favor of visual
  acuity.
In addition to their excellent visual acuity, turkeys also have awesome
  peripheral vision.
After all, it can be made and appreciated without much knowledge of art history
  or much visual acuity.
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