Definition

1. Noun:
   • A genetic condition affecting color perception: "Color vision deficiency" refers to an inherited condition where a person has difficulty distinguishing between certain colors, particularly differences in hue. It is not a form of blindness but a reduced ability to see colors normally.
   • Impaired color discrimination: The term describes the inability to perceive colors in the typical way, most often involving confusion between reds and greens, or less commonly, blues and yellows.

Usage Examples

• Noun:
  • The most common form of color vision deficiency is red-green color blindness.
  • A simple test can diagnose color vision deficiency.
  • His color vision deficiency meant he had trouble reading the color-coded chart.

Advanced Usage

• "to have a color vision deficiency": to be affected by this condition.
  • It is estimated that about 8% of men have a color vision deficiency.
• "diagnosis of color vision deficiency": the process of identifying the condition.
  • Early diagnosis of color vision deficiency can help in educational planning.

Variants and Related Words

• Color blindness (n): A common, often informal term for color vision deficiency, though it can be misleading as complete color blindness (achromatopsia) is very rare.
• Daltonism (n): A historical term for red-green color vision deficiency.
• Deuteranopia (n): A type of red-green color vision deficiency where green-sensitive cones are absent.
• Protanopia (n): A type of red-green color vision deficiency where red-sensitive cones are absent.
• Tritanopia (n): A rare blue-yellow color vision deficiency.

Synonyms

• Color blindness: Impaired color perception (note: this is the most frequent synonym but is a broader/less precise term).
• Dyschromatopsia: A medical term for a deficiency in color vision.

Related Phrases

• Color vision test: A test designed to detect color vision deficiency.
  • All pilots must pass a color vision test.
• Color deficient: An adjective phrase describing a person with this condition.
  • Color deficient individuals may see a different number in the test image.

Related Idioms

(This specific medical term is not commonly used in idiomatic expressions.)

Noun

1. genetic inability to distinguish differences in hue