For distance testing with the 'E' Snellen chart, which line should the patient start with?

For distance testing with the 'E' Snellen chart, which line should the patient start with?

• A. Top line
• B. Bottom line
• C. Middle line
• D. Any line the patient chooses

Answer: (A)

Starting with the largest letters at the top is how distance Snellen testing with the E chart is done. Those top letters are designed to be visible to almost everyone at a standard testing distance, so beginning there quickly confirms whether the patient can see at distance. From there you work downward, line by line, until the patient can’t identify the line. The smallest line read correctly is recorded as the distance acuity. This top-down approach gives a reliable baseline, keeps the test efficient, and prevents under- or overestimating vision that could happen if you started with smaller lines.

Starting with the largest letters at the top is how distance Snellen testing with the E chart is done. Those top letters are designed to be visible to almost everyone at a standard testing distance, so beginning there quickly confirms whether the patient can see at distance. From there you work downward, line by line, until the patient can’t identify the line. The smallest line read correctly is recorded as the distance acuity. This top-down approach gives a reliable baseline, keeps the test efficient, and prevents under- or overestimating vision that could happen if you started with smaller lines.