The term "red-blind" refers to a condition in which a person cannot distinguish between red and green colors. There are several synonyms that can be used to describe this condition. The term "colorblind" is commonly used to describe any type of color vision deficiency, including red-green color blindness. Another synonym is "dichromatic," which means that the person is only able to see two colors, usually blue and yellow. Other related terms include "partial color blindness," "chromatic insensitivity," and "defective color vision." While people with red-blindness may struggle to see certain colors, they are not usually completely unable to perceive color at all.