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ISHIHARA BOOK, 38 plates, Original Edition 2016, Made in JAPAN It is recognized internationally as highly reliable method of determining color deficiency Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness and red-green blindness, each in two forms, complete and incomplete. With normal color perception, the images and numbers will all be visible. Each color test plate in this hard bound. Ishihara book consists of a number of colored plates to provide color blindness test, on each plate is printed a circle made of many different sized dots of slightly different colors, spread in a random manner. Within the dot pattern, and differentiated only by color, is a number or shape. What, or even if, a number is visible indicates if and what form of color blindness the viewer has It is Most Popular and efficient test for red/green colour vision deficiency Quickly differentiates between congenital and acquired defects