Green-Weak CVD
Free Deuteranomaly
Test Online
Deuteranomaly affects ~5% of men—partial green-axis weakness. Take the free deuteranomaly test with 18 plates, no signup.
18-Plate Assessment
Free Online Color Blindness Test
Take our free Ishihara color blind test to check for red-green color blindness, deuteranopia, protanopia, and tritanopia. Get instant results with our scientifically-designed 18-plate color vision screening test. No registration required.
Optimal Setup
- Disable dark mode and blue-light filters (Night Shift, f.lux)
- Set screen brightness to at least 80%
- Ensure you are in a neutral lighting environment
- View screen from a normal reading distance
Deuteranomaly vs Deuteranopia
Deuteranomaly is partial green weakness; deuteranopia is complete green-blindness. Our deuteranomaly test uses the same Ishihara screening as a full color blind test and highlights red-green patterns.
Simulate how charts and UI look with our deuteranomaly simulator (severity slider on the simulator page).