Color Blindness Test

1. Adjust your screen brightness, turn off night mode or blue light filters, then click Start.
2. Enter the number you see on each plate, or click I don't see a number.
3. See a breakdown by plate type (red-green and blue-yellow) and guidance based on your results.

How the plates are made

The plates in this test are computer-generated—they aren't copies of Ishihara plates, which are copyrighted and calibrated for print. The number is made of dots in a color that differs from the background only through the response of one type of cone in the eye (red, green, or blue). People with all three cone types can see the number; people missing one type see the two colors as nearly identical. The dots vary randomly in brightness so the number can't be spotted just by looking for light and dark areas.

There are two control plates that almost everyone can read. If you get one wrong, the issue is likely with your screen or lighting, and your result will be marked inconclusive.

A screening test, not a diagnosis

Screen colors and brightness vary widely, so an online test can only indicate whether you may want to get an eye exam. An eye doctor can diagnose color blindness and determine its type and severity using calibrated printed plates and other tests, such as an anomaloscope.

Red-green color blindness is hereditary and affects about 8% of men and 0.5% of women. Blue-yellow color blindness is rare and may be linked to other eye conditions. If it develops suddenly, see a doctor.