In humans, which type of receptor is involved in detecting low-light conditions?

Rods are specialized photoreceptor cells located in the retina that are highly sensitive to light, making them critical for vision in low-light conditions. They do not detect color but are excellent at sensing varying levels of brightness. This allows them to function effectively in dim lighting, which is why they enable night vision. In contrast, cones are responsible for color vision and operate best in bright light, making them less effective in low-light situations. The other options, such as pupil cells and corneal receptors, do not directly contribute to the detection of light levels; instead, they play different roles in the visual process and overall eye function. Thus, rods are the correct choice for detecting low-light conditions in humans.