snellen
/ˈsnɛlən/
adjective
- Relating to a system for testing visual acuity, especially using a chart with letters of decreasing size.
- The optometrist used a Snellen chart to check my distance vision.
- The Snellen test is the standard way to measure eyesight in many clinics.
- She read the Snellen letters perfectly, achieving 20/20 vision.