38 Plates ISHIHARA Book for Colour Blindness Eye Testing
$28.00
Description
38 Plate edition of so called pseudoisochromatic plates, each of them showing either a number or some lines..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, one side for deutan defects an the other for protans.
