I was teaching a virtual Camtasia class recently and, while selecting colors for a canvas annotation, we had a robust discussion about colors. Specifically, which colors work for learners who are color blind?
According to Dr. David Nichols, University of Connecticut, approximately "one in 20 people are colorblind in some way."
When someone is colorblind, "one or more of the types of cone cells in the eyes — the cells we use to detect color — does not work normally," said Nichols. "A person who is colorblind sees a reduced color space; two colors which appear distinct to a person with normal color vision may appear to be the same to a person who is colorblind."
Nichols went on to say that "most people who are colorblind have some form of red-green colorblindness, such as deuteranomaly, deuteranopia, or protanopia."