Note this application:
Are you color blind? Find out the type and extent with this test.
This app tests your color vision to determine if you have color vision deficiency (also called color blindness). If so, it measures the type and extent of the deficiency.
8% of men and about 1% of women have red-green color blindness. Among those with red-green color blindness, there are two types: 75% are deutans, and 25% are protans. Deutans have an anomaly in the green-sensitive cone cells, and protans have an anomaly in the red-sensitive cone cells.