About This Site
A free set of colour vision tests that works in any browser, with no sign-up.
What we offer
The site has a 20-plate colour blind test that estimates type and severity, an easier single-digit test, a D-15 arrangement test, a hue test and a colour blindness simulator. Everything runs in your browser, and your answers are never sent to us.
How the tests are built
The plates are original artwork. Each figure differs from its background along a confusion line calculated with a published model of colour vision deficiency, and the scoring is checked against simulated observers. The D-15 test uses the published cap colours and scoring method. The sources are listed below.
What the tests cannot do
These are screening aids. Screens differ in colour and brightness, so a result is not a diagnosis and cannot be used for a job or licence medical. For that, see an optometrist or ophthalmologist.
Contact
Questions, corrections and feedback are welcome.
Sources
- National Eye Institute. Color Blindness. nei.nih.gov
- Birch J. Worldwide prevalence of red-green color deficiency. Journal of the Optical Society of America A. 2012;29(3):313-320. doi.org
- Machado GM, Oliveira MM, Fernandes LAF. A physiologically-based model for simulation of color vision deficiency. IEEE Transactions on Visualization and Computer Graphics. 2009;15(6):1291-1298. doi.org
- Vingrys AJ, King-Smith PE. A quantitative scoring technique for panel tests of color vision. Investigative Ophthalmology & Visual Science. 1988;29(1):50-63. pubmed.ncbi.nlm.nih.gov