colour-blindness

A person with colour-blindness cannot distinguish between red and green traffic lights.

Definition

1. Noun:
   • Inability to distinguish certain colors: "colour-blindness" is a medical condition, usually inherited, in which a person cannot perceive differences between some or all colors, most commonly red and green.
   • Figurative sense: The term can also be used metaphorically to mean the absence of racial prejudice or the practice of ignoring racial differences.

Usage Examples

• Medical condition:

  • His colour-blindness made it difficult to read traffic lights. (He cannot distinguish between red and green.)
  • Colour-blindness is more common in men than in women. (The condition affects males more frequently.)

• Figurative sense:

  • The company promotes colour-blindness in its hiring process. (The company avoids considering race when selecting employees.)
  • True colour-blindness in society would mean equal treatment for all. (A state where racial distinctions do not matter.)

Advanced Usage

• "to suffer from colour-blindness": to have the medical condition.

  • He suffers from red-green colour-blindness. (He cannot see red and green as distinct.)

• "to practice colour-blindness": to actively ignore racial or ethnic differences.

  • The teacher practices colour-blindness in her classroom. (She treats all students equally regardless of race.)

Variants and Related Words

• Colour-blind (adj): describing a person or policy that does not discriminate based on color.

  • A colour-blind approach to education. (An approach that does not consider race.)

• Colour-blindly (adv): in a manner that ignores color differences.

  • He was raised to see people colour-blindly. (He was taught to judge character, not skin color.)

Synonyms

• Achromatopsia: a medical term for total color blindness.
• Race-neutral: a term used in policy contexts for ignoring race.

Related Idioms

• See red: to become very angry, not related to colour-blindness but a pun on the inability to see red.
  • He doesn't see red when angry — he literally cannot see red due to his colour-blindness. (A humorous play on words.)

Note on Usage

• The spelling "colour-blindness" is British English; the American English equivalent is "color blindness". The figurative sense is sometimes criticized as ignoring systemic racism.