Ishihara-style color vision test — 12 plates, instant results
Click the number you see in the dots, or "Nothing" if you can't see a number
Color blindness (color vision deficiency) is a reduced ability to distinguish between certain colors. It affects approximately 8% of males and 0.5% of females of Northern European descent. Most color blindness is inherited, caused by abnormal photopigments in the cone cells of the retina.
| Type | Affected | Prevalence |
|---|---|---|
| Deuteranomaly | Weak green perception | 5% of males |
| Protanomaly | Weak red perception | 1% of males |
| Deuteranopia | No green cones | 1% of males |
| Protanopia | No red cones | 1% of males |
| Tritanomaly | Weak blue perception | Very rare |
| Tritanopia | No blue cones | Very rare |
| Achromatopsia | No color vision | 1 in 30,000 |
This test generates Ishihara-style plates with colored dots. Numbers are hidden within the pattern using specific color combinations. People with normal color vision can read the numbers easily, while those with color deficiency may see different numbers or nothing at all. The test covers red-green and blue-yellow deficiencies.
Genetic color blindness cannot be cured, but special lenses (like EnChroma glasses) can enhance color discrimination for some people. Acquired color blindness from disease or medication may improve if the underlying cause is treated. Gene therapy research is progressing and may offer future treatments.