Most common color blindness test
Red-Green Colorblind Test
This red-green colorblind test focuses on the most common color vision deficiency axis. It uses Ishihara-style plates to screen for protanopia, protanomaly, deuteranopia, and deuteranomaly.
Quick Answer
A red-green colorblind test checks whether reds, greens, oranges, and related colors are being confused. Missing several Ishihara-style plates can suggest a protan or deutan color vision deficiency, but a clinical test is needed for exact classification.
At a Glance
- Screens the most common color blindness family
- Uses Ishihara-style number plates
- Takes about 2 to 3 minutes
- Gives instant screening results
Before you start
- 1Turn off color filters, night mode, and unusual display profiles if possible.
- 2Use a normal viewing distance and avoid glare on the screen.
- 3Enter the number you see, or choose that you do not see anything.
- 4Use the blue-yellow test separately if you want a broader screening.
Take the Red-Green Colorblind Test
Answer each Ishihara-style plate below. This focused test checks the red-green confusion axis only.
Plate 1 of 10
What number do you see in the circle above?
Test Instructions
- Look at each colored circle
- Enter the number you see (if any)
- Take your time — there's no rush
- Make sure your screen brightness is normal
- Ensure good lighting conditions
Medical Disclaimer: This online test is a screening tool. While it can help identify potential color vision deficiencies, it is not a substitute for professional medical diagnosis. Screen brightness, lighting conditions, and display calibration can affect results.
How to Interpret Results
Online color vision results are most useful when you look at the pattern, not just a single answer.
Most plates correct
Suggests typical red-green discrimination on this screening.
Several plates missed
May suggest a red-green color vision deficiency such as protan or deutan deficiency.
Mixed or uncertain answers
Retake under better conditions or use a professional test for a clearer answer.
What red-green colorblindness includes
Red-green colorblindness includes protanopia and protanomaly, which affect red-sensitive cone signals, plus deuteranopia and deuteranomaly, which affect green-sensitive cone signals. These conditions are inherited most often and are much more common in men than women.
Why Ishihara-style plates are used
Ishihara-style plates use dots of different hues and similar brightness to hide a number. People with normal red-green discrimination can usually read the number. People with red-green deficiency may see a different number or no number at all.
Frequently Asked Questions
Can this tell me whether I have protanopia or deuteranopia?
Not definitively. Ishihara-style plates can flag red-green deficiency, but an anomaloscope or professional color vision test is needed to classify the exact subtype.
Does a red-green test also check blue-yellow color blindness?
No. Red-green plates do not screen for tritanopia or tritanomaly. Use the blue-yellow test or the full combined test for broader screening.
Why is red-green colorblindness so common?
The genes for red and green cone opsins are on the X chromosome, so inherited red-green color vision deficiency is much more common in males.