Agnetha explains her condition.........
Agnetha: I’m colorblind.
Bertha: How did you find out?
Agnetha: They test you when you retake your driving licence. It showed up.
Bertha: Which colors?
Agnetha: Red and green. They look the same to me.
Bertha: But you’ve been driving for years. Do you see red, see green, as different?
Agnetha: To me I do. Not to them. They took my licence away. But I managed.
Bertha: You never had an accident.
Agnetha: When the traffic stops I stop. When the traffic goes, I go. I flow.
Agnetha copes. The red light is (usually) at the top of the signal cluster.
The test of identifying a number in a matrix of colored dots identified her red/green problem. People with normal vision see "8". Red/green colorblind people see "3". But how often do we run across such a picture in daily life?