Definition

1. Noun:
   • A deficiency of color vision: Dichromia is a condition of color vision deficiency where a person can match any given color hue by mixing only two specific wavelengths of light. This contrasts with normal color vision (trichromacy), which requires the mixture of three wavelengths.

Usage Examples

• Noun:
  • Dichromia is a form of color blindness that affects the perception of red and green.
  • The test confirmed he had dichromia, meaning he sees a more limited range of colors.

Advanced Usage

• Clinical context: Dichromia is often discussed in ophthalmology and optometry when diagnosing types of color vision deficiencies.
  • The study focused on the genetic factors associated with inherited dichromia.

Variants and Related Words

• Dichromacy (n): Another term for dichromia; a condition of having only two types of functioning cone cells in the eyes.
  • Dichromacy is more common in males than females.
• Dichromat (n): A person who has dichromia.
  • As a dichromat, he has difficulty distinguishing certain colors.

Synonyms

• Color blindness (specific type): A general term for deficiencies in color vision, with dichromia being a specific form.
• Red-green color blindness: A common type of dichromia.
• Dichromatic vision: Another phrase describing the condition.

Antonyms

• Trichromacy (n): Normal color vision involving three types of cone cells.
  • Most humans have trichromacy, allowing them to see a full spectrum of colors.
• Normal color vision: The absence of color vision deficiencies.

Related Phrases

• Color vision deficiency: The broader category to which dichromia belongs.
  • Dichromia is one of several types of color vision deficiency.

Noun

1. a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)