Test Chart Book for Color Deficiency with 38 Plates Multicolor

Description

Test Chart Book for Color Deficiency with 38 Plates (Multicolor)
Color plates encased in specially designed album-type books for ease of handling. Detailed instructions included.
Includes four special plates for tests to determine the kind and degree of defect in color vision.
Hidden digit plates: only individuals with color vision defect could recognize the figure.
Diagnostic plates: intended to determine the type of color vision defect (protanopia or deuteranopia) and the severity of it.