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) .