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Color Blindness Test Charts
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Ishihara chart book is accepted by leading authorities as a simple and accurate method for discovering congenital color blindnees of two types: total color blindness and red-green blindness, each in two forms, complete and incomplete. Includes four special plates for test to determine the kind and degree of defect in color vision. Encased in specially designed album type book for ease of handling. Detailed instructions included.
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