What is the main type of photoreceptor used for vision at night?

The primary type of photoreceptor responsible for vision in low-light conditions is rods. Rods are highly sensitive to light, making them essential for nocturnal vision. They are more numerous than cones and are concentrated in peripheral regions of the retina, allowing for better detection of light in dark environments. While cones are responsible for color vision and function best in bright light conditions, they do not play a significant role in night vision. The sensitivity of rods to light enables them to detect shapes and movements in dim light, which is crucial for navigating during nighttime.