Ishihara color test instructions plates 1 17 each contain a number plates 18 24 contain one or two wiggly lines to pass each test you must identify the correct number or correctly trace the wiggly lines. Ishiharas test for colour deficiency 24 plates edition for my brother after my color blindness was cured duration 1924 the 38 plates color blindness test book . Ishiharas test for colour deficiency 38 plates edition dr shinobu ishihara introduced in 1917 almost 100 years ago the most well known color blindness test each of his tests consists of a set of colored dotted plates each of them showing either a number or a path. The series of plates designed as a test for color deficiency shinobu ishihara md drmed sc professor emeritus of the university of tokyo member of the japan academy concise edition kanehara co ltd tokyo japan introduction this series of plates is designed to provide a test which gives a quick and accurate assessment of color
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