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Online colour blindness test (colour vision)

A colour vision test on the pseudoisochromatic-plate principle (like the Ishihara and Rabkin plates): a number is hidden in a field of coloured dots — name it. The dots are chosen so the figure can be told apart only by colour, not by brightness. This is a screening reference for red-green vision, not a diagnosis — the type and degree are determined by a doctor.

A screening guide, not a diagnosis. Turn off night mode/colour filters and test under normal white light.

How the test works

On each image the number is built from dots of one colour on a background of another, similar in brightness. A person with normal colour vision reads it easily; with a red-green deficiency (the most common, colour blindness) the figure "disappears". Because the contrast is colour-only, you cannot read the number "by lightness".

We use our own images (not copies of the classic plates) — as a screen it works the same: what matters is the ability to pick out a coloured figure.

How to take it

For an honest result:

  • view under normal daylight/white lighting — coloured light distorts it;
  • do not use screen colour/night-mode filters;
  • name the number right away, without staring for long;
  • if you can’t see a number — mark it as such, that’s part of the result.

What the result means

If you named almost all numbers correctly, red-green colour vision is probably normal. Missing several plates is a reason for an in-person check: colour blindness is usually congenital and is not "cured", but it’s important to know about (professions, driving, safety).

A screen test depends on the display and colour settings, so it’s a guide. The exact form (protanopia/deuteranopia and degree) is determined with an anomaloscope by an ophthalmologist.

Frequently asked questions

  • Name the numbers hidden in images of coloured dots (pseudoisochromatic plates, like the Ishihara and Rabkin plates). If several numbers are "unreadable", a red-green colour vision deficiency is possible. This is a screening guide; the exact type and degree are determined by an ophthalmologist with an anomaloscope.

  • The test uses the same principle as the classic Ishihara and Rabkin colour plates, but with our own images rather than copies of them. As a screen it works the same way: the number of dots reads out by colour alone. Official testing on the printed plates is done by an ophthalmologist or a medical board.

  • It is a screen, not a diagnosis. The result depends on the screen and colour settings (night mode, auto-brightness distort it). It helps raise suspicion, but the final assessment and type (protan/deutan) are given by a doctor.

  • Congenital colour blindness is a lifelong trait of colour perception and is not "cured". But knowing about it matters: for certain professions, driving and safety. Acquired colour vision problems (from eye or optic nerve disease) are a separate matter assessed by a doctor.

  • Usually it is not a "black-and-white world" but reduced discrimination of red and green: these colours look dim and similar, so people confuse, say, traffic-light hues, fruit ripeness or lines on a chart. The degree ranges from a mild anomaly to a full loss of one channel. The type and degree are determined by a doctor.

  • Night mode and colour filters shift the on-screen hues, and the test relies on subtle colour contrast. This can make a normal person "miss" a number and distort the result. Turn off filters and test under normal white lighting.

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The test is a screening guide, not a diagnosis. The result depends on the screen and colour settings. The type and degree of a colour vision deficiency are determined by an ophthalmologist.