ISHIHARA Test Chart Books for Color Deficiency (14 Plate) new-and-top-selling Non-chill diaphragm

Non-chill diaphragm

This durable

10"W x 7"H x 5"D

Clean the surface until all the visible powder is gone

10 - 3-5mm

ISHIHARA Test Chart Books for Color Deficiency (14 Plate) new-and-top-selling Non-chill diaphragm(14 Plate) 11 numbers and 3 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