I N G Early diagnosis of colour vision abnormality can save a child lots of frustration, and help ease school work. The Ishihara test is part of a comprehensive eye exam. Children should have their first eye exam starting at age three, and yearly thereafter.
Colour problems are much more common in males.
Please keep in mind that computer monitors will vary widely in color representation, brightness and contrast and so these images should not be considered diagnostic. They will, however, give a good idea of how the colour testing works. Both the colour normal and those with all sorts of colour vision deficiencies read it as 12. The colour normal reads this as 8. Red-green deficient people see a 3.