Red-Weak CVD
Free Protanomaly
Test Online
Protanomaly is partial red-axis weakness—distinct from protanopia (complete red-blindness). Free protanomaly test, 18 plates.
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
Protanomaly vs Protanopia
Protanomaly test screening helps detect partial L-cone weakness. Protanopia vs protanomaly: protanopes lack functional red cones; protanomalous vision retains a shifted red channel. Use our color blind test for full screening across CVD types.