answer:In humans, the fovia is densely blanketed with cone cells, the photoreceptors that provided color vision and have the highest resolution. Away from the fovia the cone cells become sparse and rod cells predominate. The rods have low resolution and don’t handle color, but they function much better than cones in low-light conditions. So at night, our fovia becomes almost useless, because the cells there can’t function in low light. The outer zones of the retina perform much better, so our peripheral vision predominates. Nocturnal animals have a whole lot more rods than cones, but their central retina (many don’t have a fovia, properly speaking) is still more densely packed with rods than the periphery. A cat—which is naturally a nocturnal animal—has about 463,000 rods/mm^2 in the central area, and 250,000/mm^2 on the periphery. So even in the daytime, the cat’s central vision will be more acute than its peripheral vision.