englishsnow:

   by Anna Ristuccia


lindahall:

Plate 9:  Individuals with normal vision or tritanopia will see the number 56. Individuals with protanopia, deuteranopia, or achromotopsia will see no numbers.

Plate 19: Individuals with normal vision or tritanopia will see the number 5. Individuals with protanopia or deuteranopia will see the number 2. Individuals with achromotopsia will see no numbers.

Plate 34. Individuals with normal vision, tritanopia, or achromotopsia will see no numbers. Individuals with protanopia or deuteranopia will see the number 73.

From Tests for Colorblindness, Shinobu Ishihara.