The Visual Acuity test is used to determine the smallest letters you can read on a standardized chart (Snellen chart).
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Visual acuity refers to your ability to discern the shapes and details of the things you see. It’s just one factor in your overall vision. Others include color vision, peripheral vision, and depth perception. Optometrists, driver’s license bureaus, and many other organizations use this test to check your ability to see.
The Snellen test uses a chart of letters or symbols. It is a common chart found in many eye doctors' offices. Viewed from 14 to 20 feet away, this chart helps determine how well you can see letters and shapes.