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Color Vision Deficiencies

Classification

Red-Green Color deficiency

  • Deuteranomaly
    • most common
    • a type of anomalous trichomacy
    • abnormal function of green cones
  • Deuteranopia (Deutan)
    • A type of dichromacy
    • non-functioning green cones
  • Protanomaly
    • a type of anomalous trichomacy
    • abnormal functioning red cones
  • Protanopia (Protan)
    • A type of dichromacy
    • non-functioning red cones

Blue-Yellow Color deficiency

  • Tritanomaly
    • a type of anomalous trichomacy
    • abnormal function of blue cones
    • difficulty discerning between blue and green and between yellow and red
  • Tritanopia (Tritan)
    • non-functioning blue cones
    • A type of dichromacy
    • unable to discern between blue and green, purple and red, yellow and pink

Blue Cone Monochromacy

  • non-functioning red and green cones
  • only blue cones function
  • central vision is significantly affected

Complete Color Deficiency

  • Achromatopsia (monochromacy)
    • no functioning cones
    • Central vision usually affected
    • accompanied by nystagmus in congenital disease