Ishihara-inspired color vision screening with 8 plates — for educational use only.
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This Color Blindness Test presents eight Ishihara-inspired plates generated entirely in the browser using HTML5 canvas. Each plate shows a pattern of coloured dots in which a number is visible to people with normal colour vision but hidden or altered for those with red-green or blue-yellow colour vision deficiencies. Work through all eight plates, selecting the number you see or choosing 'Can't see it'. After the final plate the tool summarises your responses and suggests a likely colour vision category: Normal, Red-Green Deficiency (protanopia/deuteranopia), Blue-Yellow Deficiency (tritanopia), or Total Colour Blindness. A disclaimer reminds users this is an educational screening tool only and cannot replace a professional ophthalmological examination.
Como usar
1Read the on-screen instructions and note the educational disclaimer.
2Look at each plate and select the number you can see in the dot pattern.
3Choose 'Can't see it' if the number is not visible to you.
4Click Next to advance to the following plate.
5After all 8 plates, read your result summary and suggested colour vision type.
6Consult an eye-care professional if you are concerned about your colour vision.
Perguntas frequentes
No. This tool is for educational and entertainment purposes only. Screen calibration, ambient lighting, and display settings all affect colour reproduction and can skew results. A certified Ishihara test administered under controlled lighting conditions by an eye-care professional is the only reliable way to diagnose colour vision deficiency.
Red-green colour blindness is the most common type, affecting roughly 8% of males and 0.5% of females of Northern European descent. It includes protanopia (reduced red sensitivity) and deuteranopia (reduced green sensitivity). Affected individuals confuse reds, oranges, greens, and browns.
Tritanopia (blue-yellow deficiency) is much rarer, affecting about 0.01% of the population. It causes confusion between blue and green, and between yellow and violet. Unlike red-green types, it affects males and females equally and is not usually hereditary.
Genuine Ishihara plates are copyrighted clinical materials. This tool generates similar dot-pattern plates procedurally using the same colour-confusion principle (hiding a figure within a background of confusable hues) without reproducing the proprietary originals.
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