Test Chart Books Features: 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. 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. Consist 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 thirty-eight plates, but the existence of a deficiency may be clear after fewer plates. The Ishihara Color charts are accepted by leading authorities worldwide as a simple and accurate test method. Color plates encased in specially designed album-type books for ease of handling. Detailed instructions included. What is colorblindness? 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. However, it can be very frustrating for individuals affected by it. Those who are not color blind seem to have the misconcepti
Features & Highlights
- Grafco Ishihara Test Chart Book
- Package Info: Each
- Includes four special plates for tests to determine the kind and degree of defect in color vision.
- Image may not reflect actual product sold. Please read description carefully.
|Item Weight:||4 pounds|
|Item Size:||0 x 0 x 0 inches|
|Package Weight:||0.5 pounds|
|Package Size:||5.9 x 0.5 x 0.5 inches|
Have questions about this item, or would like to inquire about a custom or bulk order?
If you have any questions about this product by Graham Field, contact us by completing and submitting the form below. If you are looking for a specif part number, please include it with your message.
mpn: BE-CTRACLG, ean: 0606280660844,
For use on hands with a Max palm width of 4.25 inches. C TRAC is a patented medical device that offers a non-surgical, patient-controlled treatment option for Carpal Tunnel Syndrom (CTS). Just place C TRAC on your affected hand and inflate the cuff t...
By Spectre Performance
mpn: 9879, ean: 0089601987903,
Spectre's polished aluminum air inlet has a 3 1/2 outside diameter on one end and the other end connects to applications with a stock LT1 inlet. Its 90 degree bend is fabricated from polished cast aluminum. It is designed to be used with a GM MAF se...
Comfy Elbow Orthosis Custom-fitted, static-progressive orthosis mobilizes nonfixed elbow contractures. Puts low-loaded, manually adjusted tension on the elbow joint to gradually increase ROM. Splint core is malleable metal covered with closed-cell fo...