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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. Our Eye Test Chart Ishihara Color Deficiency Testing 14 Plate Book 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 specialty designed albun-type books for ease of handling. Detailed instructions included.