What type of cells are primarily used for daytime vision?

The correct answer is that cones are primarily used for daytime vision. Cones are photoreceptor cells located in the retina that are highly sensitive to bright light and are responsible for color vision and the ability to perceive fine details. They function best in well-lit conditions, which is why they are essential during the day when light levels are sufficient for visual tasks.

In contrast, rods, another type of photoreceptor, are more sensitive to low light levels and are primarily responsible for night vision. While both rods and cones are integral to the visual system, cones specifically enable clear, color vision during daylight. The presence of both types of photoreceptors ensures versatility in vision, covering both low light and high light conditions, but for optimal daytime vision, cones are the critical players.