What are rods and cones in the retina of an eye? Why is our night vision relatively poor compared t the night vision of an owl?

Rod and cones are the cells in the retina of an eye. Rods are rod-shaped cells that are sensitive to dim light. Cones are cone-shaped that are sensitive to the bright light. The night vision of human is comparatively less when compared to owl because of the presence of lesser number of rod cells.