10 Plate - For Children or Unlettered Persons
Simple and accurate method for discovering congenital color blindness and red-green blindness, each in two forms, complete and incomplete. Makes use of the peculiarity that in red-green blindness, blue and yellow appear remarkably bright compared with red and green.
- Includes four special plates for tests to determine the kind and degree of defect in color vision
- Color plates encased in specially designed album-type books for ease of handling