Snellen-style chart (demo)

Cover one eye. At 3 meters (≈10 ft), you should read down to a row labeled “20/20” on a calibrated chart. This page is not calibrated—screen size and DPI vary. For real acuity testing, visit an eye professional.

Row scale (try 100% on a phone held at 3 m)

Letters are for illustration only; spacing does not match ISO standards.