Which notation is used to describe distance visual acuity on the chart?

Which notation is used to describe distance visual acuity on the chart?

• A. Snellen notation
• B. LogMAR notation
• C. Decimal notation
• D. Near-vision notation

Answer: (A)

Distance visual acuity on the standard chart is described using Snellen notation. This system expresses how far the patient can read at a set test distance, typically 20 feet, and compares it to the distance at which a normally sighted person could read the same line. For example, 20/20 means reading at 20 feet what a person with normal vision can read at 20 feet; 20/40 means the patient reads the line at 20 feet that a normal reader could read at 40 feet, indicating reduced distance acuity. Other notations exist—LogMAR is used more in research or specialized clinics and provides a more uniform scale; Decimal notation is simply another way to express acuity (e.g., 1.0 = 20/20); Near-vision notation applies to near tasks, not distance. The standard, widely used way to describe distance acuity on the chart is Snellen notation.

Distance visual acuity on the standard chart is described using Snellen notation. This system expresses how far the patient can read at a set test distance, typically 20 feet, and compares it to the distance at which a normally sighted person could read the same line. For example, 20/20 means reading at 20 feet what a person with normal vision can read at 20 feet; 20/40 means the patient reads the line at 20 feet that a normal reader could read at 40 feet, indicating reduced distance acuity. Other notations exist—LogMAR is used more in research or specialized clinics and provides a more uniform scale; Decimal notation is simply another way to express acuity (e.g., 1.0 = 20/20); Near-vision notation applies to near tasks, not distance. The standard, widely used way to describe distance acuity on the chart is Snellen notation.