Specification Brand : KASHSURG BulletPoint1 : Vanishing design: Only people with good color vision can see the sign. If you are colorblind you won’t see anything. BulletPoint2 : Transformation design: Color blind people will see a different sign than people with no color vision handicap. BulletPoint3 : Hidden digit design: Only colorblind people are able to spot the sign. If you have perfect color vision, you won’t be able to see it. BulletPoint4 : Classification design: This is used to differentiate between red- and green-blind persons. The vanishing design is used on either side of the plate, one side for deutan defects an the other for protans. BulletPoint5 : Pack of 8 Color : Multi ItemDisplayDimensions_Length : 18.9 centimeters ItemDisplayWeight : 0.49 pounds ItemName : KASHSURG Ishihara Test Chart Books for Color Deficiency_38 Plates with User Manual & One Eye OccluderPack of 8 ItemPackageDimensions_Height : 1.97 inches ItemPackageDimensions_Length : 16.14 inches ItemPackageDimensions_Width : 2.56 inches ItemTypeKeyword : therapeutic-eye-charts Manufacturer : KASHSURG Material : Terylene cotton, wood ModelName : N-131_Pack of 8 ModelNumber : N-131_Pack of 8 NumberOfItems : 8 NumberOfLithiumMetalCells : 1 PackageLevel : unit PartNumber : N-131_Pack of 8 ProductDescription : KASHSURG Ishihara Test Chart Books for Color Deficiency _38 Plates with User Manual & One Eye OccluderPack of 8 ProductSiteLaunchDate : 2024-08-30T13:11:24.203Z Size : Pack of 8 SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 8