Ishihara® Test Chart Book for Color Deficiency, 38 Plate Book

The Ishihara® Test Chart Book for Color Deficiency is 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.

Features:

• 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
• Consists of several colored plates
• On each plate is printed a circle made of many different sized dots of slightly different colors, spread in a random manner Within the dot pattern, and differentiated only by color, is a number
• What, or even if, a number is visible indicates if and what form of color blindness the viewer has
• Full test consists of thirty-eight plates, but the existence of a deficiency may be clear after fewer plates
• Color plates encased in specially designed album-type books for ease of handling
• Detailed instructions included