24 Plate Book with Instruction Manual Edition 2012;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.;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 with red and green.;Color plates encased in specially designed album-type books for ease of handling. Detailed instructions included.
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