Research overview: rod-dominated retinas and sensitivity in low light

Cat retinas are rich in rod photoreceptors, the cells specialised for dim-light vision, and this overview reviews how this composition shapes feline sight. A high rod-to-cone ratio, combined with convergence of many rods onto each output neuron, maximises sensitivity, letting cats detect faint movement in light far too dim for human vision. The trade-off is lower acuity and reduced colour discrimination. Researchers characterise the retina through histology, electrophysiology, and behavioural sensitivity testing. Why it matters: the rod-dominated retina, working with the tapetum and a wide pupil, underlies the cat reputation for night vision and ties directly to a hunting schedule centred on dawn, dusk, and darkness. It also frames the comparison with human vision, explaining what cats gain in the dark and what they sacrifice in daylight detail and colour.