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The primary function of rods in human vision is indeed night vision. Rods are photoreceptor cells found in the retina that are highly sensitive to light, allowing us to see in dimly lit conditions. Unlike cones, which are responsible for color vision and function best in bright light, rods provide the ability to detect shapes and movements in low light environments. This heightened sensitivity makes them essential for activities like seeing in the dark or during twilight.

Rods do not detect color, which is why they are not involved in color perception. While they contribute to navigation in low-light scenarios, their primary role aligns with facilitating vision when light levels are low, making night vision their defining characteristic.