Ishihara Test Chart Books for Color Deficiency 38 Plates 2019 Edition with User Manual and One Eye Occluder
- Vanishing design: Only people with good color vision can see the sign. If you are colorblind you won’t see anything..
- Transformation design: Color blind people will see a different sign than people with no color vision handicap..
- 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..
- Classification design: This is used to differentiate between red- and green-blind persons. The vanishing design is used on either side of the plate,....