Specification Brand : IMOSEI BulletPoint1 : 【Classification Design】:Using the characteristics of red and green blind spots, blue and yellow appear very bright compared with red and green. Color plates are housed in specially designed album-style books for easy handling. BulletPoint2 : 【Wide Application】:Suitable for major optical shops, vision care centers, hospitals, optometry training centers, etc., suitable for detecting those who are color blind and weak blindness. BulletPoint3 : 【Visual Detection】:The Ishihara color spot test is that the patient must recognize numbers or patterns formed in a matrix of small colored dots of different colors and intensities (pseudo-isochromatic plates). BulletPoint4 : 【Hidden Numbers Design】:Color-blind people see different signs than people without color vision impairment. Only people who are colorblind can spot the signs. If you had perfect color vision, you wouldn't be able to see it. BulletPoint5 : 【Easy to Operate】: Taking advantage of the characteristics of red and green blind spots, blue and yellow appear very bright compared to red and green. The swatches come in a specially designed album-style book. People with color vision deficiency should see different patterns than people with normal color vision. Color : Yellow ExternallyAssignedProductIdentifier : 4865435433733 ExternallyAssignedProductIdentifier1 : 4053083020300 ExternallyAssignedProductIdentifier2 : 04053083020300 ItemName : IMOSEI Color Vision Test Book, Color Blind Test Chart, 38 Plate, Distinguish Between Colorblind Patients, Hidden Numbers and Category Design, for Vision Care Center Hospital ItemPackageDimensions_Height : 55.79 centimeters ItemPackageDimensions_Length : 6.2 centimeters ItemPackageDimensions_Width : 6.5 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : therapeutic-eye-charts Manufacturer : IMOSEI ModelNumber : VR2793UU NumberOfItems : 1 PackageLevel : unit PartNumber : ES6YD02237520 ProductDescription : Description: 1Convenient and fast: the design of this product is simple and convenient. It can be used for a long time without any tools, which is very convenient. 2.Clean Design: The clean design lets you use your laptop with a cleaner look and is easy to read.