Main features:
-A professional test book, which is a simple and accurate method for discovering congenital color blindness and red-green blindness, each in two forms, complete and incomplete.
-It 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.
-Individuals with color vision defect should see a different figure from individuals with normal color vision.
