Monochromacy (achromatopsia) occurs when none of the cones that enable color vision work. The person sees the world in black, white, and gray, similarly to an old black-and-white movie.

The degree of color blindness can range from mild to severe. The complete inability to see any colors except white, black, and gray is called achromatopsia. But this is rare. In most cases ...

The color of window blinds can make or break a room. With our tips, learn how to choose the best color blinds to suit your ...

The color you see in complete darkness isn’t black—it's Eigengrau, a mind-generated gray hue. Caused by spontaneous retinal ...

These may include: People with red-green color blindness may see many reds or greens as dull and murky. People with protanopia may confuse the following colors for one another: black with several ...

A brouhaha broke out recently when it was revealed that TED treated a talk on color blindness by Coleman Hughes (who is black, if that matters), with surprising levels of hostility. Mr. Hughes and ...