Designed as a rapid test for checking the current prescription and accuracy of the add to be prescribed. Contains words on one side and numbers on the reverse. Line increments in logMAR units in Snellen equivalent. Acuity range 8.0M to .4M (20/400 to 20/20).
Card measures 3.75" x 6.25" (9.5 cm x 15.9 cm) and testing distance is 16" (40 cm).