Cone cells are a type of cell in the retina, the layer at the back of the eye that responds to light. Cone cells detect colour.
There are three types of cones: red, green, and blue. People with colour vision problems may have different amounts of each cone type, or they may be completely missing one, two, or three of the cone types.
Medical Review:Kathleen Romito, MD - Family Medicine & Martin J. Gabica, MD - Family Medicine & Anne C. Poinier, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Christopher Joseph Rudnisky, MD, MPH, FRCSC - Ophthalmology