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The denominator in the visual acuity measurement represents the distance at which a normal eye can clearly see the chart letters. This means that if the measurement is expressed as 20/20, it indicates that a person can see at 20 feet what a person with normal vision can also see at that same distance. The visual acuity test typically uses standardized letters of varying sizes, which are placed on a chart that the patient views from a set distance, usually 20 feet in the United States.

This system effectively allows for comparing an individual's vision to the established norm, providing a clear framework for understanding visual capability. Consequently, visual acuity is crucial for determining a person's need for both corrective lenses and overall eye health assessments.