Assess the near visual acuity of 2- and 3-year-old children, or use the
cards at any age (older than 2+ years) to train an amblyopic eye. Set
contains 3 packs of 16 domino-like cards with a large symbol at one end
and a small symbol at the opposite end. Symbol sizes are 3.2M and 0.8M,
2.0M and 0.5M, and 1.25M and 0.3M. Each symbol on the card is printed
with its M unit, decimal value, 6 meter and 20 foot equivalency for
visual acuity value at 40 cm testing distance. Includes training cards
and instructions. Paper cards measure 1.6" x 2.75" (4 cm x 7 cm).