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Ishihara Test Chart Books for Color Deficiency 38 Plates with User Manual and One Eye Occluder auspowers_batchsix Premium Plastic Wire Ties withIshihara Test Chart Books for Color Deficiency 38 Plates with User Manual and One Eye Occluder Ishihara Test Chart Books for Color Deficiency 38 Plates Latest Edition with User Manual and One Eye Occluder by KASHSURG Product Features Vanishing design: Only people with good color vision can see the sign. If you are colorblind you wont see anything. Transformation design: Color blind people will see a different sign than people with no color vision