GF1255 Book Test Color Blind Ishihara 24 Plate Gf
- Graham-Field Ishihara Test Chart Books For Color Deficiency. Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness of two types: total 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. Color plates encased in specially designed album-type book for long wear and ease of use. Detailed instructions included.
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