Color Vision questions, fixes and result guides.
Practical answers for common color vision problems, confusing results and setup questions — with a direct path back to the live test.
How do I test if I am color blind online?
Take a screening with Ishihara-style plates: look at each dot-pattern plate and tap the number you see. This site generates six plates in the browser — four vanishing plates and two control plates — and shows a per-plate review. It is a screening demo, not a diagnosis.
What does it mean if I cannot see numbers on Ishihara plates?
Missing vanishing plates while reading the control plates is consistent with red-green colour deficiency. Missing a control plate usually means poor test conditions — low brightness, night mode, or dim lighting — so retake the test in daylight before drawing any conclusion, and book a professional colour-vision test to confirm.
Can a phone screen affect a color blind test?
Yes. Screen brightness, night mode or blue-light filters, the display's colour profile and room lighting all change how the plates look. Use normal brightness, switch off night mode, and sit in daylight for the most reliable screening result.
Can an online color blind test diagnose color blindness?
No. It is a screening demo only. A real diagnosis needs calibrated printed Ishihara plates under controlled light plus an eye exam. A missed plate here is a reason to book a professional test, not a diagnosis.
What is the difference between vanishing and control plates?
Vanishing plates use red-green confusion colours, so people with red-green deficiency usually cannot see the digit. Control plates use blue and yellow with strong contrast, so almost everyone can see them — missing one means the test conditions were unreliable.
Why can't I see a number on some plates?
Either the plate is a vanishing plate and your red-green colour vision differs, or the test conditions are poor — low brightness, night mode, or a dim room. Retake the test in daylight with normal brightness before drawing any conclusion.
How accurate is this color vision tool?
Plates are generated in the browser, not calibrated printed Ishihara plates — screen, brightness and lighting change results. This is a screening demo, not a diagnosis.
What should I do if the color vision result looks wrong?
If a control plate is unreadable, raise screen brightness, turn off night mode or blue-light filters, move to daylight and retake the test. For a real answer, book a professional colour-vision test.