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 Everyone should be able to easily read the number in this circle. You should see the number 12. |
 People with normal vision should see the number 8. Red-Green colour dificiency should read 8. Total colour blindness should not see any number. |
 Most people with colour vision difficulties cannot read the number in this circle. Normal vision should read the number 6. |
 Most people with red-green colour blindness can trace the winding line between the two X's. Those with normal and total colour blindness cannot follow the line. |
 Both normal and those with colour vision problems can trace the winding line between the two X's. |