Colour Discrimination Test

In short Arranging colour tiles into a smooth hue order tests how finely you can distinguish nearby colours — and it tests your display at the same time, which is the part worth understanding. A poor score most often means the screen is dim, uncalibrated, or has a blue-light filter switched on, or that the room lighting is poor. Try again with the filter off, at a comfortable brightness, in even lighting before drawing any conclusion about your eyes. This is **not a colour blindness test** and should not be used as one. Colour vision deficiency is diagnosed with printed Ishihara plates or an anomaloscope under controlled lighting, because the diagnosis depends on precise colours that no uncalibrated screen can reproduce reliably. What a hue-arrangement test does measure is discrimination — how small a difference you can detect — which is a different thing from deficiency and varies with age, fatigue and lighting in everyone. If a result genuinely concerns you, an optometrist can test it properly in a few minutes.