Cones are photoreceptors
, meaning specialized light-sensing cells of the retina in the eye. The cones enable vision
in sufficient light, i.e. mainly during the day and in artificial lighting. They are vital for the perception of colors.
The retina of the eye has around six million cones, i.e. less than rods. But it is only through these cone-like receptors that the eye is capable of visual acuity
. The concentration of cones is highest in the fovea (fovea centralis), the retinal area with the sharpest vision.