Main Menu Back to Eye Exams Adaptive Equipment Braille Eye Disorders Eye Surgery History News Research & Clinical Studies Eye Diagram Glossary   Our Other Sites Bookstore Directory Other Resources Statistics Vision Health Resources Search All Sites Site Map Resource Links Third Party Links Eye Exams - Visual Acuity Test The visual acuity test measures the smallest letters that you can read on a standardized chart at a distance of 20 feet. Visual acuity is expressed as a fraction. The top number refers to the distance you stand from the chart. This is usually 20 feet. The bottom number indicates the distance at which a person with normal eyesight could read the same line you correctly read. For example 20/20 is considered normal. 20/40 indicates that the line you correctly read letters at 20 feet that could be read by a person with normal vision at 40 feet. Using an occluder, the patient covers one eye while reading with the uncovered eye. This test helps to measure reading vision. Image courtesy of the National Eye Institute For more information visit MEDLINEplus

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