Would a person wear res strip slacks and a blue plaid shirt and orange rubber shoes? He might if he had color blindness. Color blindness is the inability to distinguish two or more shade in the spectrum. There are two kinds of color blindness. Monochromats have total color blindness, their world looks like a black and white movie. This kind of color blindness is rare and results from individuals having the only rods or only one kind of function cone. Dichromats usually have a trouble distinguishing red from green because they have just two kinds of cones. This is an inherited condition, found mostly in males.
You might think that colorblind people would quickly discover that they have a problem. In fact, many do not find out until quite late in life: they assume that others see the world exactly as they do. One boy’s dichromatic condition was first discovered when he told his mother that he was being chased home by a big green dog. If not for this, the boy might not have discovered that he was colorblind until much later in life.