ISHIHARA Test Chart Books for Color Deficiency (10 Plate) SNS Exclusive incorporating the battery and electrodes

incorporating the battery and electrodes in a single-use cartridge

1 hour of physical activity and 10 or more hours of sleep

Extended battery life - takes 15

Features an ultrabright LED light to brighten your viewing area

1-year manufacturer warranty

ISHIHARA Test Chart Books for Color Deficiency (10 Plate) SNS Exclusive incorporating the battery and electrodes(10 Plate) 4 symbols and 6 trails Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness of two types: total color blindness and red green blindness, each in two forms, complete and incomplete. Includes four special plates for tests to determine the kind and degree of defect in color vision. Makes use of the peculiarity that in red green blindness, blue and yellow appear remarkably bright compared