This standardized vision test is designed for amblyopia screening and testing children who have difficulties when tested with the standard near vision card (# 250800 ). The background is gray with the exception of a white rectangle spaced at 100% surrounding each line of symbols. Line sizes from 20/400 to 20/16 (6/120 to 6/4.8) equivalent, 0.05 to 1.25.Printed on two sides. Response key is printed on the test card. Includes training cards and instructions. Screener measures 8 in x 10 in (20.3 cm x 25.4 cm).