Health Statistics: Light

  • Number of Americans with sleep disorders: 50 to 70 million
  • Photoreceptor Peak Sensitivities:
    • ipRGC: 480 nm (teal-blue)
    • Rods: 498 nm (blue-green)
    • Cones: 555 nm (green-yellow)

 

Notes/Comments:

  • Mnemonics:
    • Think of photoreceptions being ordered from least sophisticated to most:
      • ipRGC  = light for circadian entrainment, without spatial resolution
      • Rods = black and white vision (dim light)
      • Cones = color vision
    • Think of color as progressing from blue-ish to green-ish to yellow-ish
    • Think of the peak wavelengths as rounded to 480 nm, 500 nm, 550 nm

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