Research overview: the sensitivity-acuity tradeoff in nocturnal cats

Eyes cannot maximize both light sensitivity and spatial detail at once, and the cat is a textbook example of how a nocturnal predator resolves that conflict. This survey examines the structural choices, large pupil, rod-rich retina, heavy neural pooling, and tapetal reflection, that push the feline eye toward sensitivity at the expense of acuity. It also reviews behavioral acuity measurements showing cats resolve far less fine detail than humans. The interpretation is ecological: a hunter active at twilight gains more from detecting any prey at all in near-darkness than from reading fine texture in bright light. The same logic predicts the cat's reliance on motion cues and on non-visual senses for close work. Framing feline vision as an optimized tradeoff rather than a deficiency clarifies many otherwise puzzling features of how cats look at the world.