{"product_id":"ishihara-test-chart24-plate-b","title":"ISHIHARA TEST CHART24 PLATE B","description":"\u003cp\u003eAccepted by leading authorities as a simple and accurate method for discovering congenital color blindness and redgreen 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 redgreen blindness, blue and yellow appear remarkably bright compared with red and green. Color plates encased in specially designed albumtype books for ease of handling. Detailed instructions included. 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.  There is no treatment for color blindness, nor is it usually the cause of any significant disability. 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.The Ishihara color test is a test for color blindness.Dr. Shinobu Ishihara (18791963), a professor at the University of Tokyo, who first published his tests in 1917.  It makes use of the peculiarity that in redgreen blindness, blue and yellow appear remarkably bright compared to red and green. 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. The full test consists of thirtyeight plates, but the existence of a deficiency is usually clear after fewer plates.The color plates are available in an albumtype book for ease of handling.\u003c\/p\u003e","brand":"GF HEALTH PRODUCTS","offers":[{"title":"Default Title","offer_id":67059301679219,"sku":"WBHNHB000BKSUPG","price":305.46,"currency_code":"USD","in_stock":false}],"url":"https:\/\/slickpurchase.com\/products\/ishihara-test-chart24-plate-b","provider":"Slickpurchase","version":"1.0","type":"link"}