Feature: 1. Accurate Testing: Color blindness test chart strict compliance with industry standards, drawed by the computer software, which is more accurate. 2. More Rigorous: Color deficiency test book adopted the classification and degree of generalized color abnormality, which is more scientific and rigorous. 3. Widely Use: Colorblind testing book suitable for enrollment, driving school, orientation health check and also perfect for science teachers showing students examples of color blindness. 4. 36 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. 5. Excellent 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. Specification: 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 List: 1 x Colorblind Testing Chart Note: Please note that the first few pages are described in Chinese, which does not affect the use of the product. Please make sure you would not mind before making an order.