Graham Field Ishihara Test Chart Book, for Color Deficiency, 38 Plate Book
Test Chart Books Features:&bull 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.&bull Includes four special plates for tests to determine the kind and degree of defect in color vision.&bull Makes use of the peculiarity that in red-green blindness, blue and yellow appear remarkably bright compared with red and green.&bull Consist of a number of colored plates.&bull On each plate is printed a circle made of many different sized dots of slightly different colors, spread in a random manner.&bull Within the dot pattern, and differentiated only by color, is a number.&bull What, or even if, a number is visible indicates if and what form of color blindness the viewer has.&bull The full test consists of thirty-eight plates, but the existence of a deficiency may be clear after fewer plates.&bull The Ishihara Color charts are accepted by leading authorities worldwide as a simple and accurate test method.&bull Color plates encased in specially designed album-type books for ease of handling.&bull Detailed instructions included.What is colorblindness? &bull Color blindness (color vision deficiency) is a condition in which certain colors cannot be distinguished, and is most commonly due to an inherited condition. Red/Green color blindness is by far the most common (99%) form and causes problems in distinguishing reds and greens. Another color deficiency Blue/Yellow also exists, but is rare (1%) and there is no commonly available test for it. &bull There is no treatment for color blindness, nor is it usually the cause of any significant disability. However, it can be very frustrating for individuals affected by it. Those who are not color blind seem to have the misconception that color blindness means that a color blind person sees only in black and white or shades of gray. While this sort of condition is possible, it is extremely rare.&bull The Ishihara color test is a test for color blindness&bull It was named after its designer, Dr. Shinobu Ishihara (1879-1963), a professor at the University of Tokyo, who first published his tests in 1917.&bull It makes use of the peculiarity that in red-green blindness, blue and yellow appear remarkably bright compared to red and green.&bull It consists of a number of 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.&bull The full test consists of thirty-eight plates, but the existence of a deficiency is usually clear after fewer plates.&bull The Ishihara Color Charts are accepted by leading authorities worldwide as a simple and accurate test method. &bull The color plates are available in an album-type book for ease of han crackcrackcrackcrack
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