Cone cell

Cone cells, or cones, are a type of photoreceptor cell (neurons) in the retina of the human eye. They are responsible for colour vision and function best in relatively bright light, whilst rod cells, work better in dim light.

About cone cells
  • The principal task of rod and cone cells alike is photo-transduction.
  • Photo-transduction enables pigmented chemicals to sense light and convert it into electrical signals.
  • Cone cells are most concentrated towards the macula and densely packed in the fovea centralis, but reduce in number towards the periphery of the retina.
  • There are believed to be about 120 million rod cells and 6 million cone cells in the human retina.
  • Cone cells in human eye take three forms, long-wavelength cones (L = red), medium-wavelength cones (M = green) and short-wavelength cones (S = blue) .