Cones are one of the two types of sensing cells in the retina, the light-sensitive area at the back of your eye. Cones are packed closely in the central portion of the retina, the fovea, and come in three types sensitive to different wavelengths of light. Together these give rise to colour vision. The other type of cells are rods, which are greyscale only and concentrated at the periphery of vision.
Also known as: cones
Used in glossary entries: retina, rods in the eye