Visual Acuity - AMA Manual of Style

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Visual Acuity 

Visual Acuity

Units of Measure

Phil B. Fontanarosa

and Stacy Christiansen

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Visual Acuity

Visual acuity should be reported on the basis of how the measurement was determined. For example, using the Snellen fraction with English units, 20/20 or 20/100 indicates that the person being evaluated can see at 20 ft what a person with “normal visual acuity” can see at 20 ft or at 100 ft, respectively. The equivalent metric measurements for visual acuity are 6/6 and 6/30, respectively. (See 15.13, Nomenclature, Ophthalmology Terms.)

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