Ishihara Color Blind Test Chart 10 Plates.

Ishihara Color Blind Test Chart 10 Plates.

• Original Made in Japan by Kanehara Trading Co. Tokyo, Japan
• 10 Plate Book (Unlettered Persons and Children)
• 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. Color plates encased in specially designed album-type books for ease of handling. Detailed instructions included.