How it's measured
Each plate is drawn live by your browser: a hidden digit shape is filled with dots in one color family, and the surrounding area with dots in a different, commonly-confused color family. People with typical color vision usually separate the two easily; red-green color vision deficiency can make the digit blend into the background. Your score is simply how many of the four digits you read correctly.
Frequently asked questions
Is this an official Ishihara test?
No. These plates are generated freshly by your browser, inspired by the same dot-pattern idea, but they are not the calibrated, clinically validated plates eye care professionals use.
My screen might be the problem, not my eyes — is that possible?
Yes. Screen calibration, brightness, and glare all affect these colors and can shift your result either way. A real exam controls for that.
What should I do if I miss several plates?
Consider a real eye exam with an optometrist — that's worth doing regardless, but missing plates here isn't a diagnosis on its own.