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Most people have heard of Rods and Cones in our eyes

  • Cones are for color and Rods are for night vision
  • There are 3 kinds of Cones: red, green, and blue
  • Cones don’t actually sense color, they sense wavelengths of light and these are translated by the brain in to colors
  • Its actually very rare for a person to be color “blind” (unable to see colors)
  • More commonly people have a color “deficiency”
  • This means that one type of cones is not sensing the correct wavelength
  • This result in confusion between colors

FAQ about Color Blindness:

Q: What is the most common color deficiency?

A: Green deficiency (medical term: Deuteranomoly) is most common. This results in difficulty with greens, reds, and mixtures of these colors.

Q: Is it more common in men or women?

A: Men! 8% of men have color deficiency compared to only 0.5% of women.

Q: How do I know if I have a color deficiency?
A: If you have difficulty distinguishing between greens, reds, or mixtures of these. Take a quick test by looking at the attached image one eye at a time. If you miss more than 2, you may have a color deficiency.


Written by Dr. Harbir Sian

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