A screening signal, not a diagnosis
This test is designed to screen for common patterns of colour vision deficiency, most often difficulty distinguishing between reds and greens, by seeing whether you can identify numbers or patterns hidden within fields of coloured dots. It's a widely used, quick way to flag whether further evaluation might be worthwhile, but it isn't a substitute for a full eye examination. Screen quality, lighting, and display calibration can all affect how accurately colours appear, which is exactly why a result suggesting a possible deficiency should always be followed up with an in-person assessment rather than treated as final.
Color Vision Test
Take this quick screening test to check your ability to identify numbers hidden in colored patterns.
Before You Begin
Look at each colored pattern carefully and select the number you see.
For the best experience, use a device with a normal brightness setting and avoid changing display color filters while taking the test.
What number do you see?
If you cannot see a number, select "I don't see a number".
Color Vision Screening Result
What Is Color Vision Deficiency?
Color vision deficiency is a condition in which a person has difficulty distinguishing certain colors. It is often related to differences in the way the eye and brain detect and process color.
- Red-green color vision deficiency is the most common type.
- Some people may have difficulty distinguishing blue-yellow colors.
- Complete absence of color vision is rare.
- Color perception can also be affected by lighting, display settings and other eye conditions.
Important
This online test is for screening and educational purposes only. It is not a clinical Ishihara examination and cannot diagnose color blindness or any other eye condition. Screen brightness, display quality, browser settings and ambient lighting can affect results. If you have concerns about your color vision, consult an optometrist or ophthalmologist for a comprehensive assessment.
What people usually ask about colour vision testing
Colour vision deficiency is often misunderstood, partly because it's commonly called "colour blindness" even though most people with it can still see colour, just with difficulty distinguishing certain shades from one another. Many people are also unsure whether an online test like this one can be trusted, especially given how much screen quality and lighting can vary from one device to the next, or what an unexpected result actually means for daily life, school, or certain careers. Below are clear answers to the questions we hear most often, covering how the condition works, how reliable an online screening test really is, and what steps make sense if your result raises a concern.
Difficulty identifying certain plates can suggest a colour vision deficiency, most commonly involving red green colour perception, but a single online test isn't enough to confirm this. It's a reasonable prompt to get a proper in person eye examination.
No, this is a common misconception. Most people with colour vision deficiency see colour normally in most situations but have difficulty distinguishing between specific colours, most often certain shades of red and green, rather than seeing the world in black and white.
Yes, significantly. Screen calibration, brightness, blue light filters, and even the angle you're viewing the screen from can all distort how colours appear, which is why results from an online test should be considered a starting point rather than a confirmed diagnosis.
Yes, it's significantly more common in men, since the most common forms are linked to genes on the X chromosome. Men have only one X chromosome, so a single altered gene is more likely to result in colour vision deficiency compared to women, who have two.
Most inherited forms of colour vision deficiency cannot be fully corrected, though certain glasses or lenses can help some people better distinguish between colours in specific situations. An eye specialist can discuss what options, if any, are appropriate for your specific case.
It's a reasonable thing to check, particularly before or during early school years, since a lot of early learning material relies on colour coding. Identifying a colour vision difficulty early allows teachers and parents to adjust how information is presented if needed.