Objective: Screen your color vision using Ishihara-style plates — mosaics of dots in which a number is drawn using colors that people with red-green color deficiency have difficulty telling apart.
How it works:
- Each plate hides a single digit; tap the number you see, or press its key on your keyboard (N or Space for "I don't see a number")
- The dots deliberately vary in brightness, so only color reveals the number — brightness gives no clue
- Some plates are check plates, visible regardless of color vision — they verify your screen and attention, so the result can be trusted
- Every plate is freshly generated, so no two tests are the same and answers can't be memorized
- Answer with your first impression within a few seconds, the way the test is administered clinically
Important — please read:
- Color vision deficiency cannot be trained away. Unlike the other tests on this site, this is not a training tool — it's a one-time check. Congenital red-green color deficiency is caused by the physical structure of the eye's cone cells and does not change with practice
- What can be trained is how finely you discriminate colors within your color vision — if this screening looks typical, try our Color Hue Test and Color IQ Test to measure and train that skill
- This is not a medical diagnosis. Screen color rendering varies between devices, and night-mode filters or low brightness can distort results. If this screening suggests a possible deficiency — or you have any doubt — see an optometrist for a professionally administered test
For a fair result:
- Maximum screen brightness, night-mode and blue-light filters off, in a normally lit room
- Don't stare or lean in — the plates are designed for a quick, natural viewing distance