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These specialized cells are called photoreceptors. There are 2 types of photoreceptors in the retina: rods and cones. The rods are most sensitive to light and dark changes, shape and movement and contain only one type of light-sensitive pigment. Rodsare not good for color vision.
Cone cells are densely packed in the fovea centralis, a 0.3 mm diameter rod-free area with very thin, densely packed cones which quickly reduce in number towards the periphery of the retina.⚕️
There are about six to seven million cones in a human eye and are most concentrated towards the macula.Ganglion cell (non-rod non-cone) photoreceptors. ... These light sensitive neurons contain a photopigment, melanopsin, which has an absorption peak of the light at a different wavelength (≈480 nm) than rods and cones.