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Rod cells. Colored scanning electron micrograph (SEM) of rod cells (green) in the retina of the eye. Rod cells are light-sensitive cells which respond to dim light, and so are mainly used for dark-adapted vision. They cannot detect colors, which is why vision in low light conditions is limited to shades of grey. Colors are detected by cone cells (not seen). When light falls on the tip of a rod cell, a chemical reaction sends an electrical impulse to the optic nerve (not shown), which relays it to the visual cortex of the brain. Magnification unknown.