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Description: This painting represents the rods and cones of the eye; they are specialized neurons found in the retina that are responsible for vision. The human retina contains about 120 million rod cells and 6 million cone cells. These photoreceptor cells convert light to electrical signals to send information to the occipital lobe in the brain so that we can see. Rods, in black and white, are the most numerous photoreceptor cell and are activated by low levels of light. Cones, depicted in colors, are responsible for color vision. Red cones are the most numerous, followed by green and then blue. Activation of cones requires significantly more light, and thus the reason we do not see color at night is that these photoreceptors are not activated. The signals from the rods and cones are transmitted through bipolar cells, in yellow at the bottom of the picture, to the optic nerve. Pigmented epithelial cells, top of the image, provide structure and nourishment to the photoreceptors.