Rods
Cones
Distribution
  • Distributed evenly around the whole surface of the retina.
  • Approximately 125 million rod cells in the eye.
  • Highly concentrated around the fovea.
  • Approximately 6 million cone cells in eye.
Structure
  • An elongated rod shaped cell.
  • An elongated cell with a conical ending.
Function
  • Very sensitive to light allowing for the absorption of light.
  • Suited for night vision when not much light present to provide black and white images to the brain.
  • Distinguish between colors.
  • Not very sensitive to light.
  • Not effective when minimal light is present.

les-rods-cones.jpg
Figure 10.1 representing rod cells, in blue, and cone cells, in green. The rod cell is a long rod shaped cell while the cone cell is a long cell with a conical ending.


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