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 sit approximately 75cm from your monitor with each circle set at eye level. Plates for color vision testing december 2013 doi 101055 b 006 161112. It features 32 color plates that use the principles of pseudoisochromasia distinguishing numbers and letters on a color background and pseudoanisochromasia detecting characters of differing brightness on a color background to assess and classify a wide range of disorders the authors also provide practical information on administering the test and interpreting results making the book essential for diagnosing color vision deficiency. 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 since then this is the most widely used color vision deficiency test and still
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