Features: 1Accurate Testing: Color blindness test chart strict compliance with industry standards, drawed by the computer software, which is more accurate. 2More Rigorous: Color deficiency test book adopted the classification and degree of generalized color abnormality, which is more scientific and rigorous. 3Widely Use: Colorblind testing book suitable for enrollment, driving school, orientation health check and also perfect for science teachers showing students examples of color blindness. 436 Patterns: With 36 pages, 36 images, which allow you can do your own color blindness testing at home, which is convenient for you to use. 5Excellent Paper: Color blindness test book made of high quality paper, with good touch feelings and rounded corners, which can be used for a long time. Item Type: Color Blindness Test Chart Material: Paper Images Quantity: 36 pages, 36 images Size: Approx. 21 x 14cm / 8.27 x 5.51in Package Included: 1 x Colorblind Testing Chart