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It is a misleading term because people with color blindness are not blind.
Blue color blindness is an inability to distinguish both blue and yellow, which are seen as white or gray.
Researchers studying red/green color blindness in the United Kingdom reported an average prevalence of only 4.7 percent in one group.
This indicates that the X chromosome is one of the locations for color blindness.
The inability to correctly identify colors is the only sign of color blindness.