to see some colors but not others. for instance, you may not be able to tell the difference between some reds and greens but can see blue and yellow easily.
you may see many colors, so you may not know that you see color differently from others.
you may only be able to see a few shades of color, while most people can see thousands of colors.
in rare cases, some people see only black, white, and gray.
tests measure how well you recognize different colors.
in one type of test, you look at sets of colored dots and try to find a pattern in them, such as a letter or number. the patterns you 