What chart is commonly used to measure visual acuity at 20 feet?

What chart is commonly used to measure visual acuity at 20 feet?

• A. Jaeger chart
• B. Snellen chart
• C. Ishihara plates
• D. Snellen E chart

Answer: (B)

Distance visual acuity at a standard testing distance is most commonly assessed with a Snellen chart. It features rows of letters that decrease in size, and the person reads the smallest line they can identify from a 20-foot distance. The result is expressed as a fraction like 20/20, meaning you can read at 20 feet what a person with normal vision can read at 20 feet. Jaeger charts test near vision, Ishihara plates assess color vision, and a Snellen E chart is just a version of the Snellen chart using E shapes for those who can’t read letters. So, for measuring visual acuity at 20 feet, the Snellen chart is the standard tool.

Distance visual acuity at a standard testing distance is most commonly assessed with a Snellen chart. It features rows of letters that decrease in size, and the person reads the smallest line they can identify from a 20-foot distance. The result is expressed as a fraction like 20/20, meaning you can read at 20 feet what a person with normal vision can read at 20 feet. Jaeger charts test near vision, Ishihara plates assess color vision, and a Snellen E chart is just a version of the Snellen chart using E shapes for those who can’t read letters. So, for measuring visual acuity at 20 feet, the Snellen chart is the standard tool.