What Is a Color Blindness Test?
A color blindness test is a screening tool that evaluates how well you distinguish different hues. Color vision deficiency (CVD) affects roughly 1 in 12 men and 1 in 200 women worldwide, yet many people go years without knowing they have it. This free online color blind test combines two widely recognized methods — Ishihara pseudoisochromatic plates and the Farnsworth D-15 hue arrangement — so you can screen for red-green and blue-yellow deficiencies in a single session.
How to Use This Tool
- Prepare your display — set screen brightness to maximum, disable Night Shift or blue-light filters, and sit in a well-lit room free of glare.
- Run the Ishihara plates — identify the hidden number on each of the 12 plates. Take your time; there is no strict time limit.
- Complete the D-15 arrangement — drag and arrange the colored caps in hue order, starting from the fixed reference cap.
- Review your results — the tool provides an instant score with severity hints and a breakdown by deficiency type.
The entire process takes roughly 5–10 minutes depending on your pace.
What Each Test Measures
The Ishihara test online component uses pseudoisochromatic plates — circles of colored dots with embedded numbers — to screen for protan (red-weak) and deutan (green-weak) deficiencies. It is the same method eye-care professionals have relied on since it was developed by Dr. Shinobu Ishihara in 1917.
The Farnsworth D-15 test goes a step further. By asking you to arrange color caps in sequential hue order, it can indicate the type and severity of your color discrimination errors — including tritan (blue-yellow) patterns that Ishihara plates alone may miss.
A built-in simulation demo also lets you preview how colors appear under protanopia, deuteranopia, tritanopia, and other deficiency types — useful for designers checking their own work. For a deeper simulation on full images or UI screenshots, try the color blindness simulator.
Why Take an Online Color Vision Screening?
Many people with mild CVD develop subconscious coping strategies and never realize they see colors differently. A quick online screening can flag potential issues early so you can:
- Seek a professional clinical diagnosis if results suggest a deficiency.
- Make informed choices about color-dependent tasks in education, career, and daily life.
- Adjust design and accessibility decisions — verify text-background pairs with the contrast checker and test full palettes in the palette accessibility matrix.
Tips for Accurate Results
Online color vision screening depends heavily on your display. Use a modern, calibrated monitor or device with brightness set to at least 75%. Avoid testing with colored-lens glasses or in direct sunlight. If your results look unexpected, re-test on a different device before drawing conclusions. For a quick format check on individual colors, the color converter can help verify that your display renders values as expected.
Limitations and Next Steps
This is a screening tool, not a clinical diagnosis. Results can vary with monitor quality, ambient lighting, and display calibration. If the test indicates a possible color vision deficiency, consult an eye-care professional who can administer standardized, controlled tests such as the anomaloscope or Farnsworth-Munsell 100 Hue test under proper conditions.