Final answer:
Night vision differs from daytime vision because the eyes need time to adjust from cone-dominated vision in bright light to rod-dominated vision in low light, causing difficulty in quickly changing from light to dark environments.
Step-by-step explanation:
The correct answer to the question of how vision changes at night is C, your eyes struggle adjusting from light to dark/dark to light. This is because, in brightly lit conditions, cone activity dominates your vision, which is responsible for color and acute vision that occurs primarily at the fovea where cones are densely packed. But when you transition to a dark environment, it's the rod activity that becomes important. Rods are more sensitive to light and allow us to see in low light conditions, but they require time to adjust, resulting in difficulty seeing immediately after moving from light to dark environments. This is compounded by a condition known as night blindness, where the rods do not efficiently transform light into nerve impulses, leading to difficulty seeing in dim light.