The D-15 test is a so called arrangement test. This type of color blindness tests are based on a set of colored plates or discs which have to be arranged in the correct order. Colorblind people will have difficulties to arrange the given colors and make mistakes. Based on this mistakes and the resulting confusion vector, the type of your color blindness and as well its severity can be calculated.
This pictures shows my personal test result. The 16 squares, which have to be arranged in the test, are shown in a circle—which would be the correct sequence. The thick line shows the order I’ve chosen and in this case P-15-1-14-2-3-13-12-4-5-11-10-6-7-9-8.
According to the scoring technique of Vingrys and King-Smith this results in a confusion angle of 1.2 degrees and a confusion index of 3.70. Or in other words I am suffering from a strong protan color vision deficiency, which corresponds with the diagnosis of my eye specialist.
What the D-15 color arrangement test can do:
- Differentiate between protan, deutan and tritan color vision deficiencies.
- Calculate an approximate severity of your color blindness.
… and what this color blindness test can not do:
- Detect some weak forms of color vision deficiency.
- Differentiate between dichromacies and anomalous trichromacies.
Go ahead and check out the online D-15 Farnsworth test and learn some more details about your color vision abilities—or maybe disabilities.