Ishihara Test Chart Books for Color Deficiency 38 Plates

Description

Ishihara Test Chart Books for Color Deficiency 38 Plates.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