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Ishihara’s Color perception test charts are recognized internationally as highly reliable method of determining color deficiency. With normal color perception, the images and numbers will all be visible. Each color test plate in this hard bound. Included with the book is an EYE OCCLUDER Description : This Book is specially printed to measure incrementally higher color sensitivity and specificity. Ishihara Book for Colour Blindness 38 Plates Edition : Popular and efficient test for red/green colour vision deficiency. Quickly differentiates between congenital and acquired defects