Screening tool · 3 min
Online Colour Vision Test (Ishihara-Style)
12-plate Ishihara screening for red-green colour deficiency.
What this test measures
This online color vision test is designed to help identify possible difficulties distinguishing certain colours or colour shades. It may help screen for common forms of colour vision deficiency that can affect daily activities such as reading colour coded information, school performance, workplace tasks, driving, or digital screen use.
Why it matters
Colour vision plays an important role in learning, safety, communication, and visual performance. Some colour vision deficiencies are present from childhood, while others may develop later due to eye health or medical conditions. Early awareness may help individuals better understand visual challenges and determine whether further professional assessment may be beneficial.
Who may benefit
This test may be useful for children, students, drivers, professionals working with colour sensitive tasks, individuals with a family history of colour blindness, or anyone who has noticed difficulty distinguishing colours, shades, maps, charts, or digital displays.
This free online color vision test is intended as an educational screening tool and may help identify visual patterns that deserve further professional attention during a comprehensive eye exam. While online tests cannot diagnose colour vision deficiencies, they may help users better understand symptoms that can affect learning, work, driving, sports, or daily visual tasks. You may also find our articles on children's eye exams, digital eye strain, and vision changes during daily screen use helpful for learning more about long term visual performance and eye health. If you live in Ontario, Canada, you can also book an online eye health consultation with Dr. Roxanna Gangi.
Disclaimer: This online color vision test is provided for educational and informational purposes only and is not intended to diagnose, treat, or replace a professional eye examination. Screen settings, lighting conditions, device quality, and individual visual factors may affect accuracy. If you notice visual concerns or changes in your colour perception, schedule a comprehensive eye exam or professional consultation with Dr. Roxanna Gangi.
How to take this test
- Use a well-lit room and natural daylight if possible.
- Sit about 60–75 cm from the screen.
- Look at each plate and type the number you see.
- If you can't see any number, click Can't see / skip.
- Don't overthink it — answer within a few seconds.
Take the test
Frequently asked questions
Want an expert opinion from anywhere in Ontario?
Online tools are a great starting point, but a one-on-one review with Dr. Roxanna Gangi, Optometrist can put your results in context and guide your next steps. Anyone living in Ontario, Canada can book a secure online consultancy — no need to travel to the clinic.