Farnsworth D-15 Hue Sort
FARNSWORTH
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FARNSWORTH
D-15
TEST
Drag 15 color caps into the order that looks like a smooth color progression from the reference cap. The pattern of mistakes maps to specific color confusion axes.
Why this test is different
Ishihara plates test whether you can see a hidden number. D-15 tests whether you can order colors correctly. This catches anomalous trichromacy that plates miss — and it separates deutan, protan, and tritan axes more reliably than plate-only screening.
How to take the test
Maximize brightness. Use normal indoor light — no direct sunlight on the screen.
Color accuracy on screens is affected by brightness, temperature, and ambient light more than most people realize.
The gray cap on the left is your reference — Cap 1. It is fixed.
Arrange caps 2 through 15 in the tray below so the colors flow as smoothly as possible from Cap 1.
Drag to reorder, or use keyboard: Tab to a cap, Space to pick it up, Arrow keys to move it, Space to drop
There is no time limit. Take as long as you need. You can move caps multiple times.
When the order looks right to you, tap "Submit Order"
You will test both eyes. Right eye first — cover the left with your palm.
Results
HUE SORT
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HUE SORT
PROFILE
Right eye
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Left eye
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Results Disclaimer
Results are educational screening estimates only. The D-15 on a consumer screen cannot match the accuracy of a physical Farnsworth D-15 test under calibrated illuminant C. Screen white point, color gamut, and ambient light all affect hue appearance.
Do not use these results for clinical, employment, or medical decisions.
For definitive color vision assessment, consult a licensed optometrist with a physical Farnsworth or Farnsworth-Munsell 100-Hue test kit.
The Farnsworth D-15 is referenced in OpticQuiz's published, open-access color-vision method — read the paper & open source →