Anomalies in Human Colour Perception

• Normal colour perception is trichromatic, with L, M and S cone cells.
• There are tetrochromats - a small percentage of humans, almost always female
• Color blind people are Dichromats (Protan, Deuteran, Tritan)
  • opia is the lack of a cell, whereas anomaly refers to weakness in a cell.
• Monochromats exist too