What land animal has the best eyesight?
It depends on how you define ‘best eyesight’. If you are measuring visual acuity (ability to resolve fine detail), range of colour perception, binocular depth perception, and greatest range of focal depth, then humans definitely do have the best vision of any mammal. Runners up would be some of the other great apes (i.e. chimps), and some of the arboreal frugivorous monkeys. If you’re measuring ability to detect motion, however, then many other mammals are better at detecting contrast changes that indicate something in their perceptive range is in motion. Many herbivores, such as gazelles, deer, and antelope excel at this sort of perception, but their other visual measures are rather poor. If you’re simply measuring range of visual spectrum covered, then I suspect that humans would again be on the top. There are some mammals whose range dips farther into the infrared and ultraviolet than ours does, but none of them can percieve as wide a band of the colour spectrum, from red to violet,
