Visual Acuity: What is 20/20 Vision?
There is no preparation for visual acuity testing.
Testing and Results
Visual acuity testing is simple. Your eye doctor will use a standardized letter or shape chart. You will be asked to state the smallest item that you can see. Your eyes will be tested individually and together. You will be tested with and without your glasses or contact lenses, if you wear them.
Visual acuity scores are written as a fraction for each eye. For example, 20/20 vision means that your eye sees the detail that they should see from a distance of 20 feet. A score of 20/40 means that the eye can only see detail at twenty feet that it should be able to see at 40 feet. The higher the second number, the worse the visual acuity.
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The iHealthSpot patient education library was written collaboratively by the iHealthSpot editorial team which includes Senior Medical Authors Dr. Mary Car-Blanchard, OTD/OTR/L and Valerie K. Clark, and the following editorial advisors: Steve Meadows, MD, Ernie F. Soto, DDS, Ronald J. Glatzer, MD, Jonathan Rosenberg, MD, Christopher M. Nolte, MD, David Applebaum, MD, Jonathan M. Tarrash, MD, and Paula Soto, RN/BSN. This content complies with the HONcode standard for trustworthy health information. The library commenced development on September 1, 2005 with the latest update/addition on April 13th, 2016. For information on iHealthSpot’s other services including medical website design, visit www.iHealthSpot.com.