Cone cell

Cone cells or cones are photoreceptor cells in the retina of the vertebrate eye. Cones are active in daylight conditions and enable photopic vision, as opposed to rod cells, which are active in dim light and enable scotopic vision. Most vertebrates have several classes of cones, each sensitive to a different part of the visible spectrum of light.

The comparison of the responses of different cone cell classes enables color vision.
There are about six to seven million cones in a human eye, with the highest concentration occurring towards the macula and most densely packed in the fovea centralis, a 0.
3 mm diameter rod-free area with very thin, densely packed cones.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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