This test, called Farnsworth D-15 Dichotomous Color Blindness Test, is aimed at challenging the individual’s color perception. It is designed to identify the type of color blindness or color deficiency in a person and the severity of the issue. In addition to the Ishihara Color test it also reveals signs of blue-yellow color vision deficiency.
Most color vision problems are inherited and are present at birth.
People usually have three types of cone cells in the eyes, each sensing red, green or blue light. A person sees color when the cone cells sense different amounts of these three basic colors. Inherited color blindness happens when the person doesn't one of these types of cone cells or they don't work right.
However, a color vision problem isn't always inherited. In some cases, a person can have an acquired color vision problem caused by aging, eye problems (glaucoma, macular degeneration, cataracts, and diabetic retinopathy), eye injury, some medications, alcohol abuse and the like.
How it works
You will be offered a set of colors and asked to arrange them top-down according to the most similar colors.
Based on the answers, the test identifies color blindness.
This test is universal, and can be used by all individuals.