What is the primary function of rods in the retina?

The primary function of rods in the retina is to facilitate night vision. Rods are photoreceptor cells that are highly sensitive to light but do not detect color, making them particularly effective in low-light conditions. They are abundant in the peripheral areas of the retina and are responsible for detecting motion and providing vision in dimly lit environments.

While color vision and daytime vision are primarily roles of cones, another type of photoreceptor in the retina, rods play a crucial role in enabling humans to see in darkness or at twilight. They help us perceive shapes and movements, contributing significantly to our visual processing under conditions where cones cannot function effectively. Therefore, the correct answer highlights the specific adaptation of rods for low-light vision.