This set of flash cards was designed for testing distance visual acuity in children and adults who have difficulty with visual acuity charts, the Crowded Symbol Book Test, or the Single Symbol Book Test. Line sizes from 20/200 to 20/8 (6/60 to 6/2.4) equivalent, 0.10 to 2.50. Includes response key and instructions. 30 cards per set.
Measurements:from 4 in x 5 in (10 cm x 12.7 cm) to 5 in x 5 in (12.7 cm x 12.7 cm).
Test distance: 10 feet / 3 meters