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How is Visual Acuity Measured?

Last updated 6 years ago

When you visit your eye doctor for an appointment, one of the things he or she will check is your visual acuity. The results of this test can help determine if you need eyeglasses or contacts. Here is an overview of how visual acuity is measured:

What is Visual Acuity?

Visual acuity is a measurement of how clear, or how acute, a person's vision is. The retina and certain areas of the brain are involved in the clarity of a person's sight.

What Does the Test Involve?

A visual acuity test is not painful, invasive, or difficult. A simple vision chart is used to determine your visual acuity score. The chart may have characters that are easily identified by kids, like houses, flowers, and umbrellas, or may feature letters or numbers for adults. The characters get progressively smaller the lower they are on the chart.

How is the Test Administered?

First, you will stand at a prescribed distance from the chart—twenty feet is the professional standard. You will then cover one eye and read the characters on the chart, going down the chart as far as you can.

How is the Test Scored?

After you have read the chart, you'll get a score that describes the size of the letters that you can easily see. The average person's vision is 20/20. The top number is the distance in feet that you are from the chart, and the bottom number is the size of the characters in millimeters.

How Does the Test Help Your Eye Doctor?

A visual acuity test will help your eye doctor determine your prescription for eyeglasses or contact lenses. Your eye doctor will know how to proceed in correcting your vision to the standard 20/20.

Visit Wize Eyes in Long Island for an eye exam as well as new eyeglasses and contact lenses. We offer fabulous frames to help you look your best. Call us at (888) 485-0076 to schedule a visual acuity test.


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