About ColorVision
ColorVision is a free, open-access platform that provides professional-grade colour vision screening tests — including the Ishihara, Farnsworth-Munsell 100 Hue, and D-15 Dichotomous tests — to anyone with a web browser, at no cost.
Our Mission
We believe that basic colour vision screening should be free and accessible to everyone. An estimated 300 million people worldwide have some form of colour vision deficiency, and many have never been screened. Early awareness helps people understand their vision, access appropriate accommodations, and make informed career choices.
What We Offer
- Ishihara Test — 24-plate pseudo-isochromatic screening for red-green CVD
- Farnsworth-Munsell Test — 40-cap hue discrimination test with polar error chart
- D-15 Test — Fast occupational screening dichotomous test
- Colour Blindness Simulator — Upload any image, view it through CVD filters
- Contrast Checker — WCAG accessibility tool with CVD simulation
- Educational Resources — Evidence-based articles on all aspects of colour vision
Privacy First
All tests and tools run entirely in your browser. We never transmit your test answers or results to any server. Your health information stays on your device.
Medical Disclaimer
ColorVision provides screening tools for educational and informational purposes only. Our tests are not a substitute for a clinical evaluation by a qualified eye care professional. If you suspect you have a colour vision deficiency, we encourage you to consult an optometrist or ophthalmologist for a formal diagnosis.
Contact
For questions, feedback, or accessibility concerns, please use our contact page.