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Visual Acuity.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11 ed.)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
Item type: 
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 (...