These specialized photosensitive cells are called photoreceptors. There are 2 types photoreceptors in the retina: rods and the cones. The rods are the most sensitive to the light and the dark changes, shape also the movement and contain only one type of the light-sensitive pigment. Rods are not good for the color vision.
A photoreceptor cell is the specialized type of the neuroepithelial cell which are found in the retina that is also capable of the visual phototransduction. The great biological importance of the photoreceptors is that they are convert light (visible electromagnetic radiation) into the signals that can also stimulate the biological processes.
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