A color vision test, also known as the Ishihara color test, measures your ability to tell the difference among colors. If you don’t pass this test, you may have poor color vision, or your doctor may ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. In this week’s ‘How It Works’ Jane Monzures ...

Our ability to see with color vision depends on the presence and function of light-sensing pigments in the cones of our eyes. Color blindness, or color vision deficiency, happens when one or more of ...