Saturation Threshold Test
COLOR
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COLOR
SATURATION
TEST
Two colored patches appear side by side. One is a pure hue, one is gray. Saturation decreases until you can no longer tell which is which. That threshold reveals how sensitive your color vision is — per axis, per eye.
Why this catches what plates miss
Ishihara plates test at full saturation — you either see the number or you don't. Mild anomalous trichromacy can pass plates perfectly but fail at reduced saturation, because the hue shift is small enough to overcome at high chroma. This test isolates the saturation dimension directly across four clinical axes: red, green, blue, and yellow.
How to take the test
Maximize screen brightness — this test is very sensitive to display settings
Low brightness compresses the saturation range and produces falsely low thresholds.
Cover one eye with your palm. Test both eyes separately.
Right eye first. The other eye follows automatically. Do not squint or use a lens as a cover.
Tap the patch that looks more colored — even if the difference is very small
If you truly cannot tell any difference at all, tap "I can't tell." Don't guess for the sake of it.
Four hue axes are tested: red, green, blue, yellow
Each axis runs up to 12 trials. The test ends each axis when it detects your threshold.
Results
SATURATION
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SATURATION
PROFILE
Right eye
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Left eye
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Results Disclaimer
Results are educational screening estimates only. Screen saturation is constrained by sRGB gamut — many consumer displays cannot render the full saturation range used in clinical testing. Thresholds measured here are relative to your specific display and may differ from clinical colorimetric thresholds.
Do not use these results for clinical, employment, or medical decisions.
Consult a licensed optometrist for definitive color vision assessment.